update Response API

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ggemini"
-version = "0.14.1"
+version = "0.15.0"
 edition = "2021"
 license = "MIT"
 readme = "README.md"

src/client/connection/response.rs

@@ -1,37 +1,126 @@
 //! Read and parse Gemini response as Object
 
-pub mod data;
+pub mod certificate;
+pub mod data; // @TODO deprecated
 pub mod error;
-pub mod meta;
+pub mod failure;
+pub mod input;
+pub mod redirect;
+pub mod success;
 
+pub use certificate::Certificate;
 pub use error::Error;
-pub use meta::Meta;
+pub use failure::Failure;
+pub use input::Input;
+pub use redirect::Redirect;
+pub use success::Success;
 
 use super::Connection;
-use gio::Cancellable;
-use glib::Priority;
+use gio::{Cancellable, IOStream};
+use glib::{object::IsA, Priority};
 
-pub struct Response {
-    pub connection: Connection,
-    pub meta: Meta,
+const HEADER_LEN: usize = 0x400; // 1024
+
+/// https://geminiprotocol.net/docs/protocol-specification.gmi#responses
+pub enum Response {
+    Input(Input),             // 1*
+    Success(Success),         // 2*
+    Redirect(Redirect),       // 3*
+    Failure(Failure),         // 4*,5*
+    Certificate(Certificate), // 6*
 }
 
 impl Response {
-    // Constructors
-
-    /// Create new `Self` from given `Connection`
-    /// * useful for manual [IOStream](https://docs.gtk.org/gio/class.IOStream.html) handle (based on `Meta` bytes pre-parsed)
+    /// Asynchronously create new `Self` for given `Connection`
     pub fn from_connection_async(
         connection: Connection,
         priority: Priority,
         cancellable: Cancellable,
         callback: impl FnOnce(Result<Self, Error>) + 'static,
     ) {
-        Meta::from_stream_async(connection.stream(), priority, cancellable, |result| {
-            callback(match result {
-                Ok(meta) => Ok(Self { connection, meta }),
-                Err(e) => Err(Error::Meta(e)),
-            })
-        })
+        from_stream_async(
+            Vec::with_capacity(HEADER_LEN),
+            connection.stream(),
+            cancellable,
+            priority,
+            |result| {
+                callback(match result {
+                    Ok(buffer) => match buffer.first() {
+                        Some(byte) => match byte {
+                            1 => match Input::from_utf8(&buffer) {
+                                Ok(input) => Ok(Self::Input(input)),
+                                Err(e) => Err(Error::Input(e)),
+                            },
+                            2 => match Success::from_utf8(&buffer) {
+                                Ok(success) => Ok(Self::Success(success)),
+                                Err(e) => Err(Error::Success(e)),
+                            },
+                            3 => match Redirect::from_utf8(&buffer) {
+                                Ok(redirect) => Ok(Self::Redirect(redirect)),
+                                Err(e) => Err(Error::Redirect(e)),
+                            },
+                            4 | 5 => match Failure::from_utf8(&buffer) {
+                                Ok(failure) => Ok(Self::Failure(failure)),
+                                Err(e) => Err(Error::Failure(e)),
+                            },
+                            6 => match Certificate::from_utf8(&buffer) {
+                                Ok(certificate) => Ok(Self::Certificate(certificate)),
+                                Err(e) => Err(Error::Certificate(e)),
+                            },
+                            b => Err(Error::Code(*b)),
+                        },
+                        None => Err(Error::Protocol),
+                    },
+                    Err(e) => Err(e),
+                })
+            },
+        );
     }
 }
+
+// Tools
+
+/// Asynchronously read header bytes from [IOStream](https://docs.gtk.org/gio/class.IOStream.html)
+///
+/// Return UTF-8 buffer collected
+/// * requires `IOStream` reference to keep `Connection` active in async thread
+fn from_stream_async(
+    mut buffer: Vec<u8>,
+    stream: impl IsA<IOStream>,
+    cancellable: Cancellable,
+    priority: Priority,
+    on_complete: impl FnOnce(Result<Vec<u8>, Error>) + 'static,
+) {
+    use gio::prelude::{IOStreamExt, InputStreamExtManual};
+
+    stream.input_stream().read_async(
+        vec![0],
+        priority,
+        Some(&cancellable.clone()),
+        move |result| match result {
+            Ok((mut bytes, size)) => {
+                // Expect valid header length
+                if size == 0 || buffer.len() >= HEADER_LEN {
+                    return on_complete(Err(Error::Protocol));
+                }
+
+                // Read next byte without record
+                if bytes.contains(&b'\r') {
+                    return from_stream_async(buffer, stream, cancellable, priority, on_complete);
+                }
+
+                // Complete without record
+                if bytes.contains(&b'\n') {
+                    return on_complete(Ok(buffer));
+                }
+
+                // Record
+                buffer.append(&mut bytes);
+
+                // Continue
+                from_stream_async(buffer, stream, cancellable, priority, on_complete);
+            }
+            Err((data, e)) => on_complete(Err(Error::Stream(e, data))),
+        },
+    )
+}

src/client/connection/response/certificate.rs

@@ -0,0 +1,113 @@
+pub mod error;
+pub use error::Error;
+
+const REQUIRED: (u8, &str) = (10, "Certificate required");
+const NOT_AUTHORIZED: (u8, &str) = (11, "Certificate not authorized");
+const NOT_VALID: (u8, &str) = (11, "Certificate not valid");
+
+/// 6* status code group
+/// https://geminiprotocol.net/docs/protocol-specification.gmi#client-certificates
+pub enum Certificate {
+    /// https://geminiprotocol.net/docs/protocol-specification.gmi#status-60
+    Required { message: Option<String> },
+    /// https://geminiprotocol.net/docs/protocol-specification.gmi#status-61-certificate-not-authorized
+    NotAuthorized { message: Option<String> },
+    /// https://geminiprotocol.net/docs/protocol-specification.gmi#status-62-certificate-not-valid
+    NotValid { message: Option<String> },
+}
+
+impl Certificate {
+    // Constructors
+
+    /// Create new `Self` from buffer include header bytes
+    pub fn from_utf8(buffer: &[u8]) -> Result<Self, Error> {
+        use std::str::FromStr;
+        match std::str::from_utf8(buffer) {
+            Ok(header) => Self::from_str(header),
+            Err(e) => Err(Error::Utf8Error(e)),
+        }
+    }
+
+    // Getters
+
+    pub fn to_code(&self) -> u8 {
+        match self {
+            Self::Required { .. } => REQUIRED,
+            Self::NotAuthorized { .. } => NOT_AUTHORIZED,
+            Self::NotValid { .. } => NOT_VALID,
+        }
+        .0
+    }
+
+    pub fn message(&self) -> Option<&str> {
+        match self {
+            Self::Required { message } => message,
+            Self::NotAuthorized { message } => message,
+            Self::NotValid { message } => message,
+        }
+        .as_deref()
+    }
+}
+
+impl std::fmt::Display for Certificate {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                Self::Required { message } => message.as_deref().unwrap_or(REQUIRED.1),
+                Self::NotAuthorized { message } => message.as_deref().unwrap_or(NOT_AUTHORIZED.1),
+                Self::NotValid { message } => message.as_deref().unwrap_or(NOT_VALID.1),
+            }
+        )
+    }
+}
+
+impl std::str::FromStr for Certificate {
+    type Err = Error;
+    fn from_str(header: &str) -> Result<Self, Self::Err> {
+        if let Some(postfix) = header.strip_prefix("60") {
+            return Ok(Self::Required {
+                message: message(postfix),
+            });
+        }
+        if let Some(postfix) = header.strip_prefix("61") {
+            return Ok(Self::NotAuthorized {
+                message: message(postfix),
+            });
+        }
+        if let Some(postfix) = header.strip_prefix("62") {
+            return Ok(Self::NotValid {
+                message: message(postfix),
+            });
+        }
+        Err(Error::Code)
+    }
+}
+
+// Tools
+
+fn message(value: &str) -> Option<String> {
+    let value = value.trim();
+    if value.is_empty() {
+        None
+    } else {
+        Some(value.to_string())
+    }
+}
+
+#[test]
+fn test_from_str() {
+    use std::str::FromStr;
+
+    let required = Certificate::from_str("60 Message\r\n").unwrap();
+
+    assert_eq!(required.message(), Some("Message"));
+    assert_eq!(required.to_code(), REQUIRED.0);
+
+    let required = Certificate::from_str("60\r\n").unwrap();
+
+    assert_eq!(required.message(), None);
+    assert_eq!(required.to_code(), REQUIRED.0);
+    assert_eq!(required.to_string(), REQUIRED.1);
+}

src/client/connection/response/certificate/error.rs

@@ -0,0 +1,23 @@
+use std::{
+    fmt::{Display, Formatter, Result},
+    str::Utf8Error,
+};
+
+#[derive(Debug)]
+pub enum Error {
+    Code,
+    Utf8Error(Utf8Error),
+}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut Formatter) -> Result {
+        match self {
+            Self::Code => {
+                write!(f, "Status code error")
+            }
+            Self::Utf8Error(e) => {
+                write!(f, "UTF-8 error: {e}")
+            }
+        }
+    }
+}

src/client/connection/response/error.rs

@@ -1,19 +1,50 @@
-use std::fmt::{Display, Formatter, Result};
+use std::{
+    fmt::{Display, Formatter, Result},
+    str::Utf8Error,
+};
 
 #[derive(Debug)]
 pub enum Error {
-    Meta(super::meta::Error),
-    Stream,
+    Certificate(super::certificate::Error),
+    Code(u8),
+    Failure(super::failure::Error),
+    Input(super::input::Error),
+    Protocol,
+    Redirect(super::redirect::Error),
+    Stream(glib::Error, Vec<u8>),
+    Success(super::success::Error),
+    Utf8Error(Utf8Error),
 }
 
 impl Display for Error {
     fn fmt(&self, f: &mut Formatter) -> Result {
         match self {
-            Self::Meta(e) => {
-                write!(f, "Meta read error: {e}")
+            Self::Certificate(e) => {
+                write!(f, "Certificate error: {e}")
             }
-            Self::Stream => {
-                write!(f, "I/O stream error")
+            Self::Code(e) => {
+                write!(f, "Code group error: {e}*")
+            }
+            Self::Failure(e) => {
+                write!(f, "Failure error: {e}")
+            }
+            Self::Input(e) => {
+                write!(f, "Input error: {e}")
+            }
+            Self::Protocol => {
+                write!(f, "Protocol error")
+            }
+            Self::Redirect(e) => {
+                write!(f, "Redirect error: {e}")
+            }
+            Self::Stream(e, ..) => {
+                write!(f, "I/O stream error: {e}")
+            }
+            Self::Success(e) => {
+                write!(f, "Success error: {e}")
+            }
+            Self::Utf8Error(e) => {
+                write!(f, "UTF-8 decode error: {e}")
             }
         }
     }

src/client/connection/response/failure.rs

@@ -0,0 +1,54 @@
+pub mod error;
+pub mod permanent;
+pub mod temporary;
+
+pub use error::Error;
+pub use permanent::Permanent;
+pub use temporary::Temporary;
+
+pub enum Failure {
+    /// 4* status code group
+    /// https://geminiprotocol.net/docs/protocol-specification.gmi#temporary-failure
+    Temporary(Temporary),
+    /// 5* status code group
+    /// https://geminiprotocol.net/docs/protocol-specification.gmi#permanent-failure
+    Permanent(Permanent),
+}
+
+impl Failure {
+    // Constructors
+
+    /// Create new `Self` from buffer include header bytes
+    pub fn from_utf8(buffer: &[u8]) -> Result<Self, Error> {
+        match buffer.first() {
+            Some(byte) => match byte {
+                4 => match Temporary::from_utf8(buffer) {
+                    Ok(input) => Ok(Self::Temporary(input)),
+                    Err(e) => Err(Error::Temporary(e)),
+                },
+                5 => match Permanent::from_utf8(buffer) {
+                    Ok(failure) => Ok(Self::Permanent(failure)),
+                    Err(e) => Err(Error::Permanent(e)),
+                },
+                b => Err(Error::Code(*b)),
+            },
+            None => Err(Error::Protocol),
+        }
+    }
+
+    // Getters
+
+    pub fn to_code(&self) -> u8 {
+        match self {
+            Self::Permanent(permanent) => permanent.to_code(),
+            Self::Temporary(temporary) => temporary.to_code(),
+        }
+    }
+
+    pub fn message(&self) -> Option<&str> {
+        match self {
+            Self::Permanent(permanent) => permanent.message(),
+            Self::Temporary(temporary) => temporary.message(),
+        }
+    }
+}

src/client/connection/response/failure/error.rs

@@ -0,0 +1,28 @@
+use std::fmt::{Display, Formatter, Result};
+
+#[derive(Debug)]
+pub enum Error {
+    Code(u8),
+    Permanent(super::permanent::Error),
+    Protocol,
+    Temporary(super::temporary::Error),
+}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut Formatter) -> Result {
+        match self {
+            Self::Code(e) => {
+                write!(f, "Code group error: {e}*")
+            }
+            Self::Permanent(e) => {
+                write!(f, "Permanent failure group error: {e}")
+            }
+            Self::Protocol => {
+                write!(f, "Protocol error")
+            }
+            Self::Temporary(e) => {
+                write!(f, "Temporary failure group error: {e}")
+            }
+        }
+    }
+}

src/client/connection/response/failure/permanent.rs

@@ -0,0 +1,169 @@
+pub mod error;
+pub use error::Error;
+
+const DEFAULT: (u8, &str) = (50, "Unspecified");
+const NOT_FOUND: (u8, &str) = (51, "Not found");
+const GONE: (u8, &str) = (52, "Gone");
+const PROXY_REQUEST_REFUSED: (u8, &str) = (53, "Proxy request refused");
+const BAD_REQUEST: (u8, &str) = (59, "bad-request");
+
+/// https://geminiprotocol.net/docs/protocol-specification.gmi#permanent-failure
+pub enum Permanent {
+    /// https://geminiprotocol.net/docs/protocol-specification.gmi#status-50
+    Default { message: Option<String> },
+    /// https://geminiprotocol.net/docs/protocol-specification.gmi#status-51-not-found
+    NotFound { message: Option<String> },
+    /// https://geminiprotocol.net/docs/protocol-specification.gmi#status-52-gone
+    Gone { message: Option<String> },
+    /// https://geminiprotocol.net/docs/protocol-specification.gmi#status-53-proxy-request-refused
+    ProxyRequestRefused { message: Option<String> },
+    /// https://geminiprotocol.net/docs/protocol-specification.gmi#status-59-bad-request
+    BadRequest { message: Option<String> },
+}
+
+impl Permanent {
+    // Constructors
+
+    /// Create new `Self` from buffer include header bytes
+    pub fn from_utf8(buffer: &[u8]) -> Result<Self, Error> {
+        use std::str::FromStr;
+        match std::str::from_utf8(buffer) {
+            Ok(header) => Self::from_str(header),
+            Err(e) => Err(Error::Utf8Error(e)),
+        }
+    }
+
+    // Getters
+
+    pub fn to_code(&self) -> u8 {
+        match self {
+            Self::Default { .. } => DEFAULT,
+            Self::NotFound { .. } => NOT_FOUND,
+            Self::Gone { .. } => GONE,
+            Self::ProxyRequestRefused { .. } => PROXY_REQUEST_REFUSED,
+            Self::BadRequest { .. } => BAD_REQUEST,
+        }
+        .0
+    }
+
+    pub fn message(&self) -> Option<&str> {
+        match self {
+            Self::Default { message } => message,
+            Self::NotFound { message } => message,
+            Self::Gone { message } => message,
+            Self::ProxyRequestRefused { message } => message,
+            Self::BadRequest { message } => message,
+        }
+        .as_deref()
+    }
+}
+
+impl std::fmt::Display for Permanent {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                Self::Default { message } => message.as_deref().unwrap_or(DEFAULT.1),
+                Self::NotFound { message } => message.as_deref().unwrap_or(NOT_FOUND.1),
+                Self::Gone { message } => message.as_deref().unwrap_or(GONE.1),
+                Self::ProxyRequestRefused { message } =>
+                    message.as_deref().unwrap_or(PROXY_REQUEST_REFUSED.1),
+                Self::BadRequest { message } => message.as_deref().unwrap_or(BAD_REQUEST.1),
+            }
+        )
+    }
+}
+
+impl std::str::FromStr for Permanent {
+    type Err = Error;
+    fn from_str(header: &str) -> Result<Self, Self::Err> {
+        if let Some(postfix) = header.strip_prefix("50") {
+            return Ok(Self::Default {
+                message: message(postfix),
+            });
+        }
+        if let Some(postfix) = header.strip_prefix("51") {
+            return Ok(Self::NotFound {
+                message: message(postfix),
+            });
+        }
+        if let Some(postfix) = header.strip_prefix("52") {
+            return Ok(Self::Gone {
+                message: message(postfix),
+            });
+        }
+        if let Some(postfix) = header.strip_prefix("53") {
+            return Ok(Self::ProxyRequestRefused {
+                message: message(postfix),
+            });
+        }
+        if let Some(postfix) = header.strip_prefix("59") {
+            return Ok(Self::BadRequest {
+                message: message(postfix),
+            });
+        }
+        Err(Error::Code)
+    }
+}
+
+// Tools
+
+fn message(value: &str) -> Option<String> {
+    let value = value.trim();
+    if value.is_empty() {
+        None
+    } else {
+        Some(value.to_string())
+    }
+}
+
+#[test]
+fn test_from_str() {
+    use std::str::FromStr;
+
+    // 50
+    let default = Permanent::from_str("50 Message\r\n").unwrap();
+    assert_eq!(default.message(), Some("Message"));
+    assert_eq!(default.to_code(), DEFAULT.0);
+
+    let default = Permanent::from_str("50\r\n").unwrap();
+    assert_eq!(default.message(), None);
+    assert_eq!(default.to_code(), DEFAULT.0);
+
+    // 51
+    let not_found = Permanent::from_str("51 Message\r\n").unwrap();
+    assert_eq!(not_found.message(), Some("Message"));
+    assert_eq!(not_found.to_code(), NOT_FOUND.0);
+
+    let not_found = Permanent::from_str("51\r\n").unwrap();
+    assert_eq!(not_found.message(), None);
+    assert_eq!(not_found.to_code(), NOT_FOUND.0);
+
+    // 52
+    let gone = Permanent::from_str("52 Message\r\n").unwrap();
+    assert_eq!(gone.message(), Some("Message"));
+    assert_eq!(gone.to_code(), GONE.0);
+
+    let gone = Permanent::from_str("52\r\n").unwrap();
+    assert_eq!(gone.message(), None);
+    assert_eq!(gone.to_code(), GONE.0);
+
+    // 53
+    let proxy_request_refused = Permanent::from_str("53 Message\r\n").unwrap();
+    assert_eq!(proxy_request_refused.message(), Some("Message"));
+    assert_eq!(proxy_request_refused.to_code(), PROXY_REQUEST_REFUSED.0);
+
+    let proxy_request_refused = Permanent::from_str("53\r\n").unwrap();
+    assert_eq!(proxy_request_refused.message(), None);
+    assert_eq!(proxy_request_refused.to_code(), PROXY_REQUEST_REFUSED.0);
+
+    // 59
+    let bad_request = Permanent::from_str("59 Message\r\n").unwrap();
+    assert_eq!(bad_request.message(), Some("Message"));
+    assert_eq!(bad_request.to_code(), BAD_REQUEST.0);
+
+    let bad_request = Permanent::from_str("59\r\n").unwrap();
+    assert_eq!(bad_request.message(), None);
+    assert_eq!(bad_request.to_code(), BAD_REQUEST.0);
+}

src/client/connection/response/failure/permanent/error.rs

@@ -0,0 +1,23 @@
+use std::{
+    fmt::{Display, Formatter, Result},
+    str::Utf8Error,
+};
+
+#[derive(Debug)]
+pub enum Error {
+    Code,
+    Utf8Error(Utf8Error),
+}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut Formatter) -> Result {
+        match self {
+            Self::Code => {
+                write!(f, "Status code error")
+            }
+            Self::Utf8Error(e) => {
+                write!(f, "UTF-8 error: {e}")
+            }
+        }
+    }
+}

src/client/connection/response/failure/temporary.rs

@@ -0,0 +1,169 @@
+pub mod error;
+pub use error::Error;
+
+const DEFAULT: (u8, &str) = (40, "Unspecified");
+const SERVER_UNAVAILABLE: (u8, &str) = (41, "Server unavailable");
+const CGI_ERROR: (u8, &str) = (42, "CGI error");
+const PROXY_ERROR: (u8, &str) = (43, "Proxy error");
+const SLOW_DOWN: (u8, &str) = (44, "Slow down");
+
+/// https://geminiprotocol.net/docs/protocol-specification.gmi#temporary-failure
+pub enum Temporary {
+    /// https://geminiprotocol.net/docs/protocol-specification.gmi#status-40
+    Default { message: Option<String> },
+    /// https://geminiprotocol.net/docs/protocol-specification.gmi#status-41-server-unavailable
+    ServerUnavailable { message: Option<String> },
+    /// https://geminiprotocol.net/docs/protocol-specification.gmi#status-42-cgi-error
+    CgiError { message: Option<String> },
+    /// https://geminiprotocol.net/docs/protocol-specification.gmi#status-43-proxy-error
+    ProxyError { message: Option<String> },
+    /// https://geminiprotocol.net/docs/protocol-specification.gmi#status-44-slow-down
+    SlowDown { message: Option<String> },
+}
+
+impl Temporary {
+    // Constructors
+
+    /// Create new `Self` from buffer include header bytes
+    pub fn from_utf8(buffer: &[u8]) -> Result<Self, Error> {
+        use std::str::FromStr;
+        match std::str::from_utf8(buffer) {
+            Ok(header) => Self::from_str(header),
+            Err(e) => Err(Error::Utf8Error(e)),
+        }
+    }
+
+    // Getters
+
+    pub fn to_code(&self) -> u8 {
+        match self {
+            Self::Default { .. } => DEFAULT,
+            Self::ServerUnavailable { .. } => SERVER_UNAVAILABLE,
+            Self::CgiError { .. } => CGI_ERROR,
+            Self::ProxyError { .. } => PROXY_ERROR,
+            Self::SlowDown { .. } => SLOW_DOWN,
+        }
+        .0
+    }
+
+    pub fn message(&self) -> Option<&str> {
+        match self {
+            Self::Default { message } => message,
+            Self::ServerUnavailable { message } => message,
+            Self::CgiError { message } => message,
+            Self::ProxyError { message } => message,
+            Self::SlowDown { message } => message,
+        }
+        .as_deref()
+    }
+}
+
+impl std::fmt::Display for Temporary {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                Self::Default { message } => message.as_deref().unwrap_or(DEFAULT.1),
+                Self::ServerUnavailable { message } =>
+                    message.as_deref().unwrap_or(SERVER_UNAVAILABLE.1),
+                Self::CgiError { message } => message.as_deref().unwrap_or(CGI_ERROR.1),
+                Self::ProxyError { message } => message.as_deref().unwrap_or(PROXY_ERROR.1),
+                Self::SlowDown { message } => message.as_deref().unwrap_or(SLOW_DOWN.1),
+            }
+        )
+    }
+}
+
+impl std::str::FromStr for Temporary {
+    type Err = Error;
+    fn from_str(header: &str) -> Result<Self, Self::Err> {
+        if let Some(postfix) = header.strip_prefix("40") {
+            return Ok(Self::Default {
+                message: message(postfix),
+            });
+        }
+        if let Some(postfix) = header.strip_prefix("41") {
+            return Ok(Self::ServerUnavailable {
+                message: message(postfix),
+            });
+        }
+        if let Some(postfix) = header.strip_prefix("42") {
+            return Ok(Self::CgiError {
+                message: message(postfix),
+            });
+        }
+        if let Some(postfix) = header.strip_prefix("43") {
+            return Ok(Self::ProxyError {
+                message: message(postfix),
+            });
+        }
+        if let Some(postfix) = header.strip_prefix("44") {
+            return Ok(Self::SlowDown {
+                message: message(postfix),
+            });
+        }
+        Err(Error::Code)
+    }
+}
+
+// Tools
+
+fn message(value: &str) -> Option<String> {
+    let value = value.trim();
+    if value.is_empty() {
+        None
+    } else {
+        Some(value.to_string())
+    }
+}
+
+#[test]
+fn test_from_str() {
+    use std::str::FromStr;
+
+    // 40
+    let default = Temporary::from_str("40 Message\r\n").unwrap();
+    assert_eq!(default.message(), Some("Message"));
+    assert_eq!(default.to_code(), DEFAULT.0);
+
+    let default = Temporary::from_str("40\r\n").unwrap();
+    assert_eq!(default.message(), None);
+    assert_eq!(default.to_code(), DEFAULT.0);
+
+    // 41
+    let server_unavailable = Temporary::from_str("41 Message\r\n").unwrap();
+    assert_eq!(server_unavailable.message(), Some("Message"));
+    assert_eq!(server_unavailable.to_code(), SERVER_UNAVAILABLE.0);
+
+    let server_unavailable = Temporary::from_str("41\r\n").unwrap();
+    assert_eq!(server_unavailable.message(), None);
+    assert_eq!(server_unavailable.to_code(), SERVER_UNAVAILABLE.0);
+
+    // 42
+    let cgi_error = Temporary::from_str("42 Message\r\n").unwrap();
+    assert_eq!(cgi_error.message(), Some("Message"));
+    assert_eq!(cgi_error.to_code(), CGI_ERROR.0);
+
+    let cgi_error = Temporary::from_str("42\r\n").unwrap();
+    assert_eq!(cgi_error.message(), None);
+    assert_eq!(cgi_error.to_code(), CGI_ERROR.0);
+
+    // 43
+    let proxy_error = Temporary::from_str("43 Message\r\n").unwrap();
+    assert_eq!(proxy_error.message(), Some("Message"));
+    assert_eq!(proxy_error.to_code(), PROXY_ERROR.0);
+
+    let proxy_error = Temporary::from_str("43\r\n").unwrap();
+    assert_eq!(proxy_error.message(), None);
+    assert_eq!(proxy_error.to_code(), PROXY_ERROR.0);
+
+    // 44
+    let slow_down = Temporary::from_str("44 Message\r\n").unwrap();
+    assert_eq!(slow_down.message(), Some("Message"));
+    assert_eq!(slow_down.to_code(), SLOW_DOWN.0);
+
+    let slow_down = Temporary::from_str("44\r\n").unwrap();
+    assert_eq!(slow_down.message(), None);
+    assert_eq!(slow_down.to_code(), SLOW_DOWN.0);
+}

src/client/connection/response/failure/temporary/error.rs

@@ -0,0 +1,23 @@
+use std::{
+    fmt::{Display, Formatter, Result},
+    str::Utf8Error,
+};
+
+#[derive(Debug)]
+pub enum Error {
+    Code,
+    Utf8Error(Utf8Error),
+}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut Formatter) -> Result {
+        match self {
+            Self::Code => {
+                write!(f, "Status code error")
+            }
+            Self::Utf8Error(e) => {
+                write!(f, "UTF-8 error: {e}")
+            }
+        }
+    }
+}

src/client/connection/response/input.rs

@@ -0,0 +1,109 @@
+pub mod error;
+pub use error::Error;
+
+const DEFAULT: (u8, &str) = (10, "Input");
+const SENSITIVE: (u8, &str) = (11, "Sensitive input");
+
+pub enum Input {
+    Default { message: Option<String> },
+    Sensitive { message: Option<String> },
+}
+
+impl Input {
+    // Constructors
+
+    /// Create new `Self` from buffer include header bytes
+    pub fn from_utf8(buffer: &[u8]) -> Result<Self, Error> {
+        use std::str::FromStr;
+        match std::str::from_utf8(buffer) {
+            Ok(header) => Self::from_str(header),
+            Err(e) => Err(Error::Utf8Error(e)),
+        }
+    }
+
+    // Getters
+
+    pub fn to_code(&self) -> u8 {
+        match self {
+            Self::Default { .. } => DEFAULT,
+            Self::Sensitive { .. } => SENSITIVE,
+        }
+        .0
+    }
+
+    pub fn message(&self) -> Option<&str> {
+        match self {
+            Self::Default { message } => message,
+            Self::Sensitive { message } => message,
+        }
+        .as_deref()
+    }
+}
+
+impl std::fmt::Display for Input {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                Self::Default { message } => message.as_deref().unwrap_or(DEFAULT.1),
+                Self::Sensitive { message } => message.as_deref().unwrap_or(SENSITIVE.1),
+            }
+        )
+    }
+}
+
+impl std::str::FromStr for Input {
+    type Err = Error;
+    fn from_str(header: &str) -> Result<Self, Self::Err> {
+        if let Some(postfix) = header.strip_prefix("10") {
+            return Ok(Self::Default {
+                message: message(postfix),
+            });
+        }
+        if let Some(postfix) = header.strip_prefix("11") {
+            return Ok(Self::Sensitive {
+                message: message(postfix),
+            });
+        }
+        Err(Error::Protocol)
+    }
+}
+
+// Tools
+
+fn message(value: &str) -> Option<String> {
+    let value = value.trim();
+    if value.is_empty() {
+        None
+    } else {
+        Some(value.to_string())
+    }
+}
+
+#[test]
+fn test_from_str() {
+    use std::str::FromStr;
+
+    // 10
+    let default = Input::from_str("10 Default\r\n").unwrap();
+    assert_eq!(default.to_code(), DEFAULT.0);
+    assert_eq!(default.message(), Some("Default"));
+    assert_eq!(default.to_string(), "Default");
+
+    let default = Input::from_str("10\r\n").unwrap();
+    assert_eq!(default.to_code(), DEFAULT.0);
+    assert_eq!(default.message(), None);
+    assert_eq!(default.to_string(), DEFAULT.1);
+
+    // 11
+    let sensitive = Input::from_str("11 Sensitive\r\n").unwrap();
+    assert_eq!(sensitive.to_code(), SENSITIVE.0);
+    assert_eq!(sensitive.message(), Some("Sensitive"));
+    assert_eq!(sensitive.to_string(), "Sensitive");
+
+    let sensitive = Input::from_str("11\r\n").unwrap();
+    assert_eq!(sensitive.to_code(), SENSITIVE.0);
+    assert_eq!(sensitive.message(), None);
+    assert_eq!(sensitive.to_string(), SENSITIVE.1);
+}

src/client/connection/response/input/error.rs

@@ -1,16 +1,19 @@
-use std::fmt::{Display, Formatter, Result};
+use std::{
+    fmt::{Display, Formatter, Result},
+    str::Utf8Error,
+};
 
 #[derive(Debug)]
 pub enum Error {
-    Decode(std::string::FromUtf8Error),
     Protocol,
+    Utf8Error(Utf8Error),
 }
 
 impl Display for Error {
     fn fmt(&self, f: &mut Formatter) -> Result {
         match self {
-            Self::Decode(e) => {
-                write!(f, "Decode error: {e}")
+            Self::Utf8Error(e) => {
+                write!(f, "UTF-8 error: {e}")
             }
             Self::Protocol => {
                 write!(f, "Protocol error")

src/client/connection/response/meta.rs

@@ -1,147 +0,0 @@
-//! Components for reading and parsing meta bytes from response:
-//! * [Gemini status code](https://geminiprotocol.net/docs/protocol-specification.gmi#status-codes)
-//! * meta data (for interactive statuses like 10, 11, 30 etc)
-//! * MIME type
-
-pub mod data;
-pub mod error;
-pub mod mime;
-pub mod status;
-
-pub use data::Data;
-pub use error::Error;
-pub use mime::Mime;
-pub use status::Status;
-
-use gio::{
-    prelude::{IOStreamExt, InputStreamExtManual},
-    Cancellable, IOStream,
-};
-use glib::{object::IsA, Priority};
-
-pub const MAX_LEN: usize = 0x400; // 1024
-
-pub struct Meta {
-    pub status: Status,
-    pub data: Option<Data>,
-    pub mime: Option<Mime>,
-    // @TODO
-    // charset: Option<Charset>,
-    // language: Option<Language>,
-}
-
-impl Meta {
-    // Constructors
-
-    /// Create new `Self` from UTF-8 buffer
-    /// * supports entire response or just meta slice
-    pub fn from_utf8(buffer: &[u8]) -> Result<Self, Error> {
-        // Calculate buffer length once
-        let len = buffer.len();
-
-        // Parse meta bytes only
-        match buffer.get(..if len > MAX_LEN { MAX_LEN } else { len }) {
-            Some(slice) => {
-                // Parse data
-                let data = Data::from_utf8(slice);
-
-                if let Err(e) = data {
-                    return Err(Error::Data(e));
-                }
-
-                // MIME
-
-                let mime = Mime::from_utf8(slice);
-
-                if let Err(e) = mime {
-                    return Err(Error::Mime(e));
-                }
-
-                // Status
-
-                let status = Status::from_utf8(slice);
-
-                if let Err(e) = status {
-                    return Err(Error::Status(e));
-                }
-
-                Ok(Self {
-                    data: data.unwrap(),
-                    mime: mime.unwrap(),
-                    status: status.unwrap(),
-                })
-            }
-            None => Err(Error::Protocol),
-        }
-    }
-
-    /// Asynchronously create new `Self` from [IOStream](https://docs.gtk.org/gio/class.IOStream.html)
-    pub fn from_stream_async(
-        stream: impl IsA<IOStream>,
-        priority: Priority,
-        cancellable: Cancellable,
-        on_complete: impl FnOnce(Result<Self, Error>) + 'static,
-    ) {
-        read_from_stream_async(
-            Vec::with_capacity(MAX_LEN),
-            stream,
-            cancellable,
-            priority,
-            |result| match result {
-                Ok(buffer) => on_complete(Self::from_utf8(&buffer)),
-                Err(e) => on_complete(Err(e)),
-            },
-        );
-    }
-}
-
-// Tools
-
-/// Asynchronously read all meta bytes from [IOStream](https://docs.gtk.org/gio/class.IOStream.html)
-///
-/// Return UTF-8 buffer collected
-/// * require `IOStream` reference to keep `Connection` active in async thread
-pub fn read_from_stream_async(
-    mut buffer: Vec<u8>,
-    stream: impl IsA<IOStream>,
-    cancellable: Cancellable,
-    priority: Priority,
-    on_complete: impl FnOnce(Result<Vec<u8>, Error>) + 'static,
-) {
-    stream.input_stream().read_async(
-        vec![0],
-        priority,
-        Some(&cancellable.clone()),
-        move |result| match result {
-            Ok((mut bytes, size)) => {
-                // Expect valid header length
-                if size == 0 || buffer.len() >= MAX_LEN {
-                    return on_complete(Err(Error::Protocol));
-                }
-
-                // Read next byte without record
-                if bytes.contains(&b'\r') {
-                    return read_from_stream_async(
-                        buffer,
-                        stream,
-                        cancellable,
-                        priority,
-                        on_complete,
-                    );
-                }
-
-                // Complete without record
-                if bytes.contains(&b'\n') {
-                    return on_complete(Ok(buffer));
-                }
-
-                // Record
-                buffer.append(&mut bytes);
-
-                // Continue
-                read_from_stream_async(buffer, stream, cancellable, priority, on_complete);
-            }
-            Err((data, e)) => on_complete(Err(Error::InputStream(data, e))),
-        },
-    );
-}

src/client/connection/response/meta/charset.rs

@@ -1 +0,0 @@
-// @TODO

src/client/connection/response/meta/data.rs

@@ -1,82 +0,0 @@
-//! Components for reading and parsing meta **data** bytes from response
-//! (e.g. placeholder text for 10, 11, url string for 30, 31 etc)
-
-pub mod error;
-pub use error::Error;
-
-use glib::GString;
-
-/// Meta **data** holder
-///
-/// For example, `value` could contain:
-/// * placeholder text for 10, 11 status
-/// * URL string for 30, 31 status
-pub struct Data(GString);
-
-impl Data {
-    // Constructors
-
-    /// Parse meta **data** from UTF-8 buffer
-    /// from entire response or just header slice
-    ///
-    /// * result could be `None` for some [status codes](https://geminiprotocol.net/docs/protocol-specification.gmi#status-codes)
-    ///   that does not expect any data in header
-    pub fn from_utf8(buffer: &[u8]) -> Result<Option<Self>, Error> {
-        // Define max buffer length for this method
-        const MAX_LEN: usize = 0x400; // 1024
-
-        // Init bytes buffer
-        let mut bytes: Vec<u8> = Vec::with_capacity(MAX_LEN);
-
-        // Calculate len once
-        let len = buffer.len();
-
-        // Skip 3 bytes for status code of `MAX_LEN` expected
-        match buffer.get(3..if len > MAX_LEN { MAX_LEN - 3 } else { len }) {
-            Some(slice) => {
-                for &byte in slice {
-                    // End of header
-                    if byte == b'\r' {
-                        break;
-                    }
-
-                    // Continue
-                    bytes.push(byte);
-                }
-
-                // Assumes the bytes are valid UTF-8
-                match GString::from_utf8(bytes) {
-                    Ok(data) => Ok(match data.is_empty() {
-                        false => Some(Self(data)),
-                        true => None,
-                    }),
-                    Err(e) => Err(Error::Decode(e)),
-                }
-            }
-            None => Err(Error::Protocol),
-        }
-    }
-
-    // Getters
-
-    /// Get `Self` as `std::str`
-    pub fn as_str(&self) -> &str {
-        self.0.as_str()
-    }
-
-    /// Get `Self` as `glib::GString`
-    pub fn as_gstring(&self) -> &GString {
-        &self.0
-    }
-
-    /// Get `glib::GString` copy of `Self`
-    pub fn to_gstring(&self) -> GString {
-        self.0.clone()
-    }
-}
-
-impl std::fmt::Display for Data {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        write!(f, "{}", self.0)
-    }
-}

src/client/connection/response/meta/error.rs

@@ -1,33 +0,0 @@
-use std::fmt::{Display, Formatter, Result};
-
-#[derive(Debug)]
-pub enum Error {
-    Data(super::data::Error),
-    InputStream(Vec<u8>, glib::Error),
-    Mime(super::mime::Error),
-    Protocol,
-    Status(super::status::Error),
-}
-
-impl Display for Error {
-    fn fmt(&self, f: &mut Formatter) -> Result {
-        match self {
-            Self::Data(e) => {
-                write!(f, "Data error: {e}")
-            }
-            Self::InputStream(_, e) => {
-                // @TODO
-                write!(f, "Input stream error: {e}")
-            }
-            Self::Mime(e) => {
-                write!(f, "MIME error: {e}")
-            }
-            Self::Protocol => {
-                write!(f, "Protocol error")
-            }
-            Self::Status(e) => {
-                write!(f, "Status error: {e}")
-            }
-        }
-    }
-}

src/client/connection/response/meta/language.rs

@@ -1 +0,0 @@
-// @TODO

src/client/connection/response/meta/mime.rs

@@ -1,70 +0,0 @@
-//! MIME type parser for different data types
-
-pub mod error;
-pub use error::Error;
-
-use glib::{Regex, RegexCompileFlags, RegexMatchFlags};
-
-/// MIME type holder for `Response` (by [Gemtext specification](https://geminiprotocol.net/docs/gemtext-specification.gmi#media-type-parameters))
-/// * the value stored in lowercase
-pub struct Mime(String);
-
-impl Mime {
-    // Constructors
-
-    /// Create new `Self` from UTF-8 buffer (that includes **header**)
-    /// * return `None` for non 2* [status codes](https://geminiprotocol.net/docs/protocol-specification.gmi#status-codes)
-    pub fn from_utf8(buffer: &[u8]) -> Result<Option<Self>, Error> {
-        // Define max buffer length for this method
-        const MAX_LEN: usize = 0x400; // 1024
-
-        // Calculate buffer length once
-        let len = buffer.len();
-
-        // Parse meta bytes only
-        match buffer.get(..if len > MAX_LEN { MAX_LEN } else { len }) {
-            Some(b) => match std::str::from_utf8(b) {
-                Ok(s) => Self::from_string(s),
-                Err(e) => Err(Error::Decode(e)),
-            },
-            None => Err(Error::Protocol),
-        }
-    }
-
-    /// Create new `Self` from `str::str` that includes **header**
-    /// * return `None` for non 2* [status codes](https://geminiprotocol.net/docs/protocol-specification.gmi#status-codes)
-    pub fn from_string(s: &str) -> Result<Option<Self>, Error> {
-        if !s.starts_with("2") {
-            return Ok(None);
-        }
-        match parse(s) {
-            Some(v) => Ok(Some(Self(v))),
-            None => Err(Error::Undefined),
-        }
-    }
-
-    // Getters
-
-    /// Get `Self` as lowercase `std::str`
-    pub fn as_str(&self) -> &str {
-        self.0.as_str()
-    }
-}
-
-impl std::fmt::Display for Mime {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        write!(f, "{}", self.0)
-    }
-}
-
-/// Extract MIME type from from string that includes **header**
-pub fn parse(s: &str) -> Option<String> {
-    Regex::split_simple(
-        r"^2\d{1}\s([^\/]+\/[^\s;]+)",
-        s,
-        RegexCompileFlags::DEFAULT,
-        RegexMatchFlags::DEFAULT,
-    )
-    .get(1)
-    .map(|this| this.to_lowercase())
-}

src/client/connection/response/meta/mime/error.rs

@@ -1,22 +0,0 @@
-#[derive(Debug)]
-pub enum Error {
-    Decode(std::str::Utf8Error),
-    Protocol,
-    Undefined,
-}
-
-impl std::fmt::Display for Error {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        match self {
-            Self::Decode(e) => {
-                write!(f, "Decode error: {e}")
-            }
-            Self::Protocol => {
-                write!(f, "Protocol error")
-            }
-            Self::Undefined => {
-                write!(f, "MIME type undefined")
-            }
-        }
-    }
-}

src/client/connection/response/meta/status.rs

@@ -1,109 +0,0 @@
-//! Parser and holder tools for
-//! [Status code](https://geminiprotocol.net/docs/protocol-specification.gmi#status-codes)
-
-pub mod error;
-pub use error::Error;
-
-/// Holder for [status code](https://geminiprotocol.net/docs/protocol-specification.gmi#status-codes)
-#[derive(Debug)]
-pub enum Status {
-    // Input
-    Input = 10,
-    SensitiveInput = 11,
-    // Success
-    Success = 20,
-    // Redirect
-    Redirect = 30,
-    PermanentRedirect = 31,
-    // Temporary failure
-    TemporaryFailure = 40,
-    ServerUnavailable = 41,
-    CgiError = 42,
-    ProxyError = 43,
-    SlowDown = 44,
-    // Permanent failure
-    PermanentFailure = 50,
-    NotFound = 51,
-    ResourceGone = 52,
-    ProxyRequestRefused = 53,
-    BadRequest = 59,
-    // Client certificates
-    CertificateRequest = 60,
-    CertificateUnauthorized = 61,
-    CertificateInvalid = 62,
-}
-
-impl std::fmt::Display for Status {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        write!(
-            f,
-            "{}",
-            match self {
-                Status::Input => "Input",
-                Status::SensitiveInput => "Sensitive Input",
-                Status::Success => "Success",
-                Status::Redirect => "Redirect",
-                Status::PermanentRedirect => "Permanent Redirect",
-                Status::TemporaryFailure => "Temporary Failure",
-                Status::ServerUnavailable => "Server Unavailable",
-                Status::CgiError => "CGI Error",
-                Status::ProxyError => "Proxy Error",
-                Status::SlowDown => "Slow Down",
-                Status::PermanentFailure => "Permanent Failure",
-                Status::NotFound => "Not Found",
-                Status::ResourceGone => "Resource Gone",
-                Status::ProxyRequestRefused => "Proxy Request Refused",
-                Status::BadRequest => "Bad Request",
-                Status::CertificateRequest => "Certificate Request",
-                Status::CertificateUnauthorized => "Certificate Unauthorized",
-                Status::CertificateInvalid => "Certificate Invalid",
-            }
-        )
-    }
-}
-
-impl Status {
-    /// Create new `Self` from UTF-8 buffer
-    ///
-    /// * includes `Self::from_string` parser, it means that given buffer should contain some **header**
-    pub fn from_utf8(buffer: &[u8]) -> Result<Self, Error> {
-        match buffer.get(0..2) {
-            Some(b) => match std::str::from_utf8(b) {
-                Ok(s) => Self::from_string(s),
-                Err(e) => Err(Error::Decode(e)),
-            },
-            None => Err(Error::Protocol),
-        }
-    }
-
-    /// Create new `Self` from string that includes **header**
-    pub fn from_string(code: &str) -> Result<Self, Error> {
-        match code {
-            // Input
-            "10" => Ok(Self::Input),
-            "11" => Ok(Self::SensitiveInput),
-            // Success
-            "20" => Ok(Self::Success),
-            // Redirect
-            "30" => Ok(Self::Redirect),
-            "31" => Ok(Self::PermanentRedirect),
-            // Temporary failure
-            "40" => Ok(Self::TemporaryFailure),
-            "41" => Ok(Self::ServerUnavailable),
-            "42" => Ok(Self::CgiError),
-            "43" => Ok(Self::ProxyError),
-            "44" => Ok(Self::SlowDown),
-            // Permanent failure
-            "50" => Ok(Self::PermanentFailure),
-            "51" => Ok(Self::NotFound),
-            "52" => Ok(Self::ResourceGone),
-            "53" => Ok(Self::ProxyRequestRefused),
-            "59" => Ok(Self::BadRequest),
-            // Client certificates
-            "60" => Ok(Self::CertificateRequest),
-            "61" => Ok(Self::CertificateUnauthorized),
-            "62" => Ok(Self::CertificateInvalid),
-            _ => Err(Error::Undefined),
-        }
-    }
-}

src/client/connection/response/redirect.rs

@@ -0,0 +1,112 @@
+pub mod error;
+pub use error::Error;
+
+use glib::GStringPtr;
+
+const TEMPORARY: u8 = 30;
+const PERMANENT: u8 = 31;
+
+pub enum Redirect {
+    /// https://geminiprotocol.net/docs/protocol-specification.gmi#status-30-temporary-redirection
+    Temporary { target: String },
+    /// https://geminiprotocol.net/docs/protocol-specification.gmi#status-31-permanent-redirection
+    Permanent { target: String },
+}
+
+impl Redirect {
+    // Constructors
+
+    /// Create new `Self` from buffer include header bytes
+    pub fn from_utf8(buffer: &[u8]) -> Result<Self, Error> {
+        use std::str::FromStr;
+        match std::str::from_utf8(buffer) {
+            Ok(header) => Self::from_str(header),
+            Err(e) => Err(Error::Utf8Error(e)),
+        }
+    }
+
+    // Convertors
+
+    pub fn to_code(&self) -> u8 {
+        match self {
+            Self::Permanent { .. } => PERMANENT,
+            Self::Temporary { .. } => TEMPORARY,
+        }
+    }
+
+    // Getters
+
+    pub fn target(&self) -> &str {
+        match self {
+            Self::Permanent { target } => target,
+            Self::Temporary { target } => target,
+        }
+    }
+}
+
+impl std::fmt::Display for Redirect {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                Self::Permanent { target } => format!("Permanent redirection to `{target}`"),
+                Self::Temporary { target } => format!("Temporary redirection to `{target}`"),
+            }
+        )
+    }
+}
+
+impl std::str::FromStr for Redirect {
+    type Err = Error;
+    fn from_str(header: &str) -> Result<Self, Self::Err> {
+        use glib::{Regex, RegexCompileFlags, RegexMatchFlags};
+
+        let regex = Regex::split_simple(
+            r"^3(\d)\s([^\r\n]+)",
+            header,
+            RegexCompileFlags::DEFAULT,
+            RegexMatchFlags::DEFAULT,
+        );
+
+        match regex.get(1) {
+            Some(code) => match code.as_str() {
+                "0" => Ok(Self::Temporary {
+                    target: target(regex.get(2))?,
+                }),
+                "1" => Ok(Self::Permanent {
+                    target: target(regex.get(2))?,
+                }),
+                _ => todo!(),
+            },
+            None => Err(Error::Protocol),
+        }
+    }
+}
+
+fn target(value: Option<&GStringPtr>) -> Result<String, Error> {
+    match value {
+        Some(target) => {
+            let target = target.trim();
+            if target.is_empty() {
+                Err(Error::Target)
+            } else {
+                Ok(target.to_string())
+            }
+        }
+        None => Err(Error::Target),
+    }
+}
+
+#[test]
+fn test_from_str() {
+    use std::str::FromStr;
+
+    let temporary = Redirect::from_str("30 /uri\r\n").unwrap();
+    assert_eq!(temporary.target(), "/uri");
+    assert_eq!(temporary.to_code(), TEMPORARY);
+
+    let permanent = Redirect::from_str("31 /uri\r\n").unwrap();
+    assert_eq!(permanent.target(), "/uri");
+    assert_eq!(permanent.to_code(), PERMANENT);
+}

src/client/connection/response/redirect/error.rs

@@ -0,0 +1,27 @@
+use std::{
+    fmt::{Display, Formatter, Result},
+    str::Utf8Error,
+};
+
+#[derive(Debug)]
+pub enum Error {
+    Protocol,
+    Target,
+    Utf8Error(Utf8Error),
+}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut Formatter) -> Result {
+        match self {
+            Self::Utf8Error(e) => {
+                write!(f, "UTF-8 error: {e}")
+            }
+            Self::Protocol => {
+                write!(f, "Protocol error")
+            }
+            Self::Target => {
+                write!(f, "Target error")
+            }
+        }
+    }
+}

src/client/connection/response/success.rs

@@ -0,0 +1,89 @@
+pub mod error;
+pub use error::Error;
+
+const DEFAULT: (u8, &str) = (20, "Success");
+
+pub enum Success {
+    Default { mime: String },
+    // reserved for 2* codes
+}
+
+impl Success {
+    // Constructors
+
+    /// Create new `Self` from buffer include header bytes
+    pub fn from_utf8(buffer: &[u8]) -> Result<Self, Error> {
+        use std::str::FromStr;
+        match std::str::from_utf8(buffer) {
+            Ok(header) => Self::from_str(header),
+            Err(e) => Err(Error::Utf8Error(e)),
+        }
+    }
+
+    // Convertors
+
+    pub fn to_code(&self) -> u8 {
+        match self {
+            Self::Default { .. } => DEFAULT.0,
+        }
+    }
+
+    // Getters
+
+    pub fn mime(&self) -> &str {
+        match self {
+            Self::Default { mime } => mime,
+        }
+    }
+}
+
+impl std::fmt::Display for Success {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                Self::Default { .. } => DEFAULT.1,
+            }
+        )
+    }
+}
+
+impl std::str::FromStr for Success {
+    type Err = Error;
+    fn from_str(header: &str) -> Result<Self, Self::Err> {
+        use glib::{Regex, RegexCompileFlags, RegexMatchFlags};
+
+        match Regex::split_simple(
+            r"^20\s([^\/]+\/[^\s;]+)",
+            header,
+            RegexCompileFlags::DEFAULT,
+            RegexMatchFlags::DEFAULT,
+        )
+        .get(1)
+        {
+            Some(mime) => {
+                let mime = mime.trim();
+                if mime.is_empty() {
+                    Err(Error::Mime)
+                } else {
+                    Ok(Self::Default {
+                        mime: mime.to_lowercase(),
+                    })
+                }
+            }
+            None => Err(Error::Protocol),
+        }
+    }
+}
+
+#[test]
+fn test_from_str() {
+    use std::str::FromStr;
+
+    let default = Success::from_str("20 text/gemini; charset=utf-8; lang=en\r\n").unwrap();
+
+    assert_eq!(default.mime(), "text/gemini");
+    assert_eq!(default.to_code(), DEFAULT.0);
+    assert_eq!(default.to_string(), DEFAULT.1);
+}

src/client/connection/response/success/error.rs

@@ -1,23 +1,26 @@
-use std::fmt::{Display, Formatter, Result};
+use std::{
+    fmt::{Display, Formatter, Result},
+    str::Utf8Error,
+};
 
 #[derive(Debug)]
 pub enum Error {
-    Decode(std::str::Utf8Error),
     Protocol,
-    Undefined,
+    Mime,
+    Utf8Error(Utf8Error),
 }
 
 impl Display for Error {
     fn fmt(&self, f: &mut Formatter) -> Result {
         match self {
-            Self::Decode(e) => {
-                write!(f, "Decode error: {e}")
+            Self::Utf8Error(e) => {
+                write!(f, "UTF-8 error: {e}")
             }
             Self::Protocol => {
                 write!(f, "Protocol error")
             }
-            Self::Undefined => {
-                write!(f, "Undefined")
+            Self::Mime => {
+                write!(f, "MIME error")
             }
         }
     }