1 files changed, 122 insertions, 0 deletions
diff --git a/vendor/gix-credentials/src/protocol/context/serde.rs b/vendor/gix-credentials/src/protocol/context/serde.rs
new file mode 100644
index 000000000..964195263
--- /dev/null
+++ b/vendor/gix-credentials/src/protocol/context/serde.rs
@@ -0,0 +1,122 @@
+use bstr::BStr;
+
+use crate::protocol::context::Error;
+
+mod write {
+    use bstr::{BStr, BString};
+
+    use crate::protocol::{context::serde::validate, Context};
+
+    impl Context {
+        /// Write ourselves to `out` such that [`from_bytes()`][Self::from_bytes()] can decode it losslessly.
+        pub fn write_to(&self, mut out: impl std::io::Write) -> std::io::Result<()> {
+            use bstr::ByteSlice;
+            fn write_key(out: &mut impl std::io::Write, key: &str, value: &BStr) -> std::io::Result<()> {
+                out.write_all(key.as_bytes())?;
+                out.write_all(b"=")?;
+                out.write_all(value)?;
+                out.write_all(b"\n")
+            }
+            for (key, value) in [("url", &self.url), ("path", &self.path)] {
+                if let Some(value) = value {
+                    validate(key, value.as_slice().into())
+                        .map_err(|err| std::io::Error::new(std::io::ErrorKind::Other, err))?;
+                    write_key(&mut out, key, value.as_ref())?;
+                }
+            }
+            for (key, value) in [
+                ("protocol", &self.protocol),
+                ("host", &self.host),
+                ("username", &self.username),
+                ("password", &self.password),
+            ] {
+                if let Some(value) = value {
+                    validate(key, value.as_str().into())
+                        .map_err(|err| std::io::Error::new(std::io::ErrorKind::Other, err))?;
+                    write_key(&mut out, key, value.as_bytes().as_bstr())?;
+                }
+            }
+            Ok(())
+        }
+
+        /// Like [`write_to()`][Self::write_to()], but writes infallibly into memory.
+        pub fn to_bstring(&self) -> BString {
+            let mut buf = Vec::<u8>::new();
+            self.write_to(&mut buf).expect("infallible");
+            buf.into()
+        }
+    }
+}
+
+///
+pub mod decode {
+    use std::convert::TryFrom;
+
+    use bstr::{BString, ByteSlice};
+
+    use crate::protocol::{context, context::serde::validate, Context};
+
+    /// The error returned by [`from_bytes()`][Context::from_bytes()].
+    #[derive(Debug, thiserror::Error)]
+    #[allow(missing_docs)]
+    pub enum Error {
+        #[error("Illformed UTF-8 in value of key {key:?}: {value:?}")]
+        IllformedUtf8InValue { key: String, value: BString },
+        #[error(transparent)]
+        Encoding(#[from] context::Error),
+        #[error("Invalid format in line {line:?}, expecting key=value")]
+        Syntax { line: BString },
+    }
+
+    impl Context {
+        /// Decode ourselves from `input` which is the format written by [`write_to()`][Self::write_to()].
+        pub fn from_bytes(input: &[u8]) -> Result<Self, Error> {
+            let mut ctx = Context::default();
+            for res in input.lines().take_while(|line| !line.is_empty()).map(|line| {
+                let mut it = line.splitn(2, |b| *b == b'=');
+                match (it.next().and_then(|k| k.to_str().ok()), it.next().map(|v| v.as_bstr())) {
+                    (Some(key), Some(value)) => validate(key, value)
+                        .map(|_| (key, value.to_owned()))
+                        .map_err(Into::into),
+                    _ => Err(Error::Syntax { line: line.into() }),
+                }
+            }) {
+                let (key, value) = res?;
+                match key {
+                    "protocol" | "host" | "username" | "password" => {
+                        if !value.is_utf8() {
+                            return Err(Error::IllformedUtf8InValue { key: key.into(), value });
+                        }
+                        let value = value.to_string();
+                        *match key {
+                            "protocol" => &mut ctx.protocol,
+                            "host" => &mut ctx.host,
+                            "username" => &mut ctx.username,
+                            "password" => &mut ctx.password,
+                            _ => unreachable!("checked field names in match above"),
+                        } = Some(value);
+                    }
+                    "url" => ctx.url = Some(value),
+                    "path" => ctx.path = Some(value),
+                    "quit" => {
+                        ctx.quit = gix_config_value::Boolean::try_from(value.as_ref())
+                            .ok()
+                            .map(|b| b.into());
+                    }
+                    _ => {}
+                }
+            }
+            Ok(ctx)
+        }
+    }
+}
+
+fn validate(key: &str, value: &BStr) -> Result<(), Error> {
+    if key.contains('\0') || key.contains('\n') || value.contains(&0) || value.contains(&b'\n') {
+        return Err(Error::Encoding {
+            key: key.to_owned(),
+            value: value.to_owned(),
+        });
+    }
+    Ok(())
+}