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</pre></div><pre class="rust"><code><span class="kw">use </span>std::{
fmt::{<span class="self">self</span>, Display, Write},
str::FromStr,
};
<span class="kw">use super</span>::{HeaderValue, InvalidHeaderValue, TryIntoHeaderValue, Writer};
<span class="doccomment">/// check that each char in the slice is either:
/// 1. `%x21`, or
/// 2. in the range `%x23` to `%x7E`, or
/// 3. above `%x80`
</span><span class="kw">fn </span>entity_validate_char(c: u8) -> bool {
c == <span class="number">0x21 </span>|| (<span class="number">0x23</span>..=<span class="number">0x7e</span>).contains(<span class="kw-2">&</span>c) || (c >= <span class="number">0x80</span>)
}
<span class="kw">fn </span>check_slice_validity(slice: <span class="kw-2">&</span>str) -> bool {
slice.bytes().all(entity_validate_char)
}
<span class="doccomment">/// An entity tag, defined in [RFC 7232 §2.3].
///
/// An entity tag consists of a string enclosed by two literal double quotes.
/// Preceding the first double quote is an optional weakness indicator,
/// which always looks like `W/`. Examples for valid tags are `"xyzzy"` and
/// `W/"xyzzy"`.
///
/// # ABNF
/// ```plain
/// entity-tag = [ weak ] opaque-tag
/// weak = %x57.2F ; "W/", case-sensitive
/// opaque-tag = DQUOTE *etagc DQUOTE
/// etagc = %x21 / %x23-7E / obs-text
/// ; VCHAR except double quotes, plus obs-text
/// ```
///
/// # Comparison
/// To check if two entity tags are equivalent in an application always use the
/// `strong_eq` or `weak_eq` methods based on the context of the Tag. Only use
/// `==` to check if two tags are identical.
///
/// The example below shows the results for a set of entity-tag pairs and
/// both the weak and strong comparison function results:
///
/// | `ETag 1`| `ETag 2`| Strong Comparison | Weak Comparison |
/// |---------|---------|-------------------|-----------------|
/// | `W/"1"` | `W/"1"` | no match | match |
/// | `W/"1"` | `W/"2"` | no match | no match |
/// | `W/"1"` | `"1"` | no match | match |
/// | `"1"` | `"1"` | match | match |
///
/// [RFC 7232 §2.3](https://datatracker.ietf.org/doc/html/rfc7232#section-2.3)
</span><span class="attr">#[derive(Debug, Clone, PartialEq, Eq)]
</span><span class="kw">pub struct </span>EntityTag {
<span class="doccomment">/// Weakness indicator for the tag
</span><span class="kw">pub </span>weak: bool,
<span class="doccomment">/// The opaque string in between the DQUOTEs
</span>tag: String,
}
<span class="kw">impl </span>EntityTag {
<span class="doccomment">/// Constructs a new `EntityTag`.
///
/// # Panics
/// If the tag contains invalid characters.
</span><span class="kw">pub fn </span>new(weak: bool, tag: String) -> EntityTag {
<span class="macro">assert!</span>(check_slice_validity(<span class="kw-2">&</span>tag), <span class="string">"Invalid tag: {:?}"</span>, tag);
EntityTag { weak, tag }
}
<span class="doccomment">/// Constructs a new weak EntityTag.
///
/// # Panics
/// If the tag contains invalid characters.
</span><span class="kw">pub fn </span>new_weak(tag: String) -> EntityTag {
EntityTag::new(<span class="bool-val">true</span>, tag)
}
<span class="attr">#[deprecated(since = <span class="string">"3.0.0"</span>, note = <span class="string">"Renamed to `new_weak`."</span>)]
</span><span class="kw">pub fn </span>weak(tag: String) -> EntityTag {
<span class="self">Self</span>::new_weak(tag)
}
<span class="doccomment">/// Constructs a new strong EntityTag.
///
/// # Panics
/// If the tag contains invalid characters.
</span><span class="kw">pub fn </span>new_strong(tag: String) -> EntityTag {
EntityTag::new(<span class="bool-val">false</span>, tag)
}
<span class="attr">#[deprecated(since = <span class="string">"3.0.0"</span>, note = <span class="string">"Renamed to `new_strong`."</span>)]
</span><span class="kw">pub fn </span>strong(tag: String) -> EntityTag {
<span class="self">Self</span>::new_strong(tag)
}
<span class="doccomment">/// Returns tag.
</span><span class="kw">pub fn </span>tag(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str {
<span class="self">self</span>.tag.as_ref()
}
<span class="doccomment">/// Sets tag.
///
/// # Panics
/// If the tag contains invalid characters.
</span><span class="kw">pub fn </span>set_tag(<span class="kw-2">&mut </span><span class="self">self</span>, tag: <span class="kw">impl </span>Into<String>) {
<span class="kw">let </span>tag = tag.into();
<span class="macro">assert!</span>(check_slice_validity(<span class="kw-2">&</span>tag), <span class="string">"Invalid tag: {:?}"</span>, tag);
<span class="self">self</span>.tag = tag
}
<span class="doccomment">/// For strong comparison two entity-tags are equivalent if both are not weak and their
/// opaque-tags match character-by-character.
</span><span class="kw">pub fn </span>strong_eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>EntityTag) -> bool {
!<span class="self">self</span>.weak && !other.weak && <span class="self">self</span>.tag == other.tag
}
<span class="doccomment">/// For weak comparison two entity-tags are equivalent if their opaque-tags match
/// character-by-character, regardless of either or both being tagged as "weak".
</span><span class="kw">pub fn </span>weak_eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>EntityTag) -> bool {
<span class="self">self</span>.tag == other.tag
}
<span class="doccomment">/// Returns the inverse of `strong_eq()`.
</span><span class="kw">pub fn </span>strong_ne(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>EntityTag) -> bool {
!<span class="self">self</span>.strong_eq(other)
}
<span class="doccomment">/// Returns inverse of `weak_eq()`.
</span><span class="kw">pub fn </span>weak_ne(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>EntityTag) -> bool {
!<span class="self">self</span>.weak_eq(other)
}
}
<span class="kw">impl </span>Display <span class="kw">for </span>EntityTag {
<span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result {
<span class="kw">if </span><span class="self">self</span>.weak {
<span class="macro">write!</span>(f, <span class="string">"W/\"{}\""</span>, <span class="self">self</span>.tag)
} <span class="kw">else </span>{
<span class="macro">write!</span>(f, <span class="string">"\"{}\""</span>, <span class="self">self</span>.tag)
}
}
}
<span class="kw">impl </span>FromStr <span class="kw">for </span>EntityTag {
<span class="kw">type </span><span class="prelude-val">Err </span>= <span class="kw">crate</span>::error::ParseError;
<span class="kw">fn </span>from_str(slice: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><EntityTag, <span class="kw">crate</span>::error::ParseError> {
<span class="kw">let </span>length = slice.len();
<span class="comment">// Early exits if it doesn't terminate in a DQUOTE.
</span><span class="kw">if </span>!slice.ends_with(<span class="string">'"'</span>) || slice.len() < <span class="number">2 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="kw">crate</span>::error::ParseError::Header);
}
<span class="comment">// The etag is weak if its first char is not a DQUOTE.
</span><span class="kw">if </span>slice.len() >= <span class="number">2 </span>&& slice.starts_with(<span class="string">'"'</span>) && check_slice_validity(<span class="kw-2">&</span>slice[<span class="number">1</span>..length - <span class="number">1</span>])
{
<span class="comment">// No need to check if the last char is a DQUOTE,
// we already did that above.
</span><span class="kw">return </span><span class="prelude-val">Ok</span>(EntityTag {
weak: <span class="bool-val">false</span>,
tag: slice[<span class="number">1</span>..length - <span class="number">1</span>].to_owned(),
});
} <span class="kw">else if </span>slice.len() >= <span class="number">4
</span>&& slice.starts_with(<span class="string">"W/\""</span>)
&& check_slice_validity(<span class="kw-2">&</span>slice[<span class="number">3</span>..length - <span class="number">1</span>])
{
<span class="kw">return </span><span class="prelude-val">Ok</span>(EntityTag {
weak: <span class="bool-val">true</span>,
tag: slice[<span class="number">3</span>..length - <span class="number">1</span>].to_owned(),
});
}
<span class="prelude-val">Err</span>(<span class="kw">crate</span>::error::ParseError::Header)
}
}
<span class="kw">impl </span>TryIntoHeaderValue <span class="kw">for </span>EntityTag {
<span class="kw">type </span>Error = InvalidHeaderValue;
<span class="kw">fn </span>try_into_value(<span class="self">self</span>) -> <span class="prelude-ty">Result</span><HeaderValue, <span class="self">Self</span>::Error> {
<span class="kw">let </span><span class="kw-2">mut </span>wrt = Writer::new();
<span class="macro">write!</span>(wrt, <span class="string">"{}"</span>, <span class="self">self</span>).unwrap();
HeaderValue::from_maybe_shared(wrt.take())
}
}
<span class="attr">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use </span><span class="kw">super</span>::EntityTag;
<span class="attr">#[test]
</span><span class="kw">fn </span>test_etag_parse_success() {
<span class="comment">// Expected success
</span><span class="macro">assert_eq!</span>(
<span class="string">"\"foobar\""</span>.parse::<EntityTag>().unwrap(),
EntityTag::new_strong(<span class="string">"foobar"</span>.to_owned())
);
<span class="macro">assert_eq!</span>(
<span class="string">"\"\""</span>.parse::<EntityTag>().unwrap(),
EntityTag::new_strong(<span class="string">""</span>.to_owned())
);
<span class="macro">assert_eq!</span>(
<span class="string">"W/\"weaktag\""</span>.parse::<EntityTag>().unwrap(),
EntityTag::new_weak(<span class="string">"weaktag"</span>.to_owned())
);
<span class="macro">assert_eq!</span>(
<span class="string">"W/\"\x65\x62\""</span>.parse::<EntityTag>().unwrap(),
EntityTag::new_weak(<span class="string">"\x65\x62"</span>.to_owned())
);
<span class="macro">assert_eq!</span>(
<span class="string">"W/\"\""</span>.parse::<EntityTag>().unwrap(),
EntityTag::new_weak(<span class="string">""</span>.to_owned())
);
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_etag_parse_failures() {
<span class="comment">// Expected failures
</span><span class="macro">assert!</span>(<span class="string">"no-dquotes"</span>.parse::<EntityTag>().is_err());
<span class="macro">assert!</span>(<span class="string">"w/\"the-first-w-is-case-sensitive\""
</span>.parse::<EntityTag>()
.is_err());
<span class="macro">assert!</span>(<span class="string">""</span>.parse::<EntityTag>().is_err());
<span class="macro">assert!</span>(<span class="string">"\"unmatched-dquotes1"</span>.parse::<EntityTag>().is_err());
<span class="macro">assert!</span>(<span class="string">"unmatched-dquotes2\""</span>.parse::<EntityTag>().is_err());
<span class="macro">assert!</span>(<span class="string">"matched-\"dquotes\""</span>.parse::<EntityTag>().is_err());
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_etag_fmt() {
<span class="macro">assert_eq!</span>(
<span class="macro">format!</span>(<span class="string">"{}"</span>, EntityTag::new_strong(<span class="string">"foobar"</span>.to_owned())),
<span class="string">"\"foobar\""
</span>);
<span class="macro">assert_eq!</span>(<span class="macro">format!</span>(<span class="string">"{}"</span>, EntityTag::new_strong(<span class="string">""</span>.to_owned())), <span class="string">"\"\""</span>);
<span class="macro">assert_eq!</span>(
<span class="macro">format!</span>(<span class="string">"{}"</span>, EntityTag::new_weak(<span class="string">"weak-etag"</span>.to_owned())),
<span class="string">"W/\"weak-etag\""
</span>);
<span class="macro">assert_eq!</span>(
<span class="macro">format!</span>(<span class="string">"{}"</span>, EntityTag::new_weak(<span class="string">"\u{0065}"</span>.to_owned())),
<span class="string">"W/\"\x65\""
</span>);
<span class="macro">assert_eq!</span>(<span class="macro">format!</span>(<span class="string">"{}"</span>, EntityTag::new_weak(<span class="string">""</span>.to_owned())), <span class="string">"W/\"\""</span>);
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_cmp() {
<span class="comment">// | ETag 1 | ETag 2 | Strong Comparison | Weak Comparison |
// |---------|---------|-------------------|-----------------|
// | `W/"1"` | `W/"1"` | no match | match |
// | `W/"1"` | `W/"2"` | no match | no match |
// | `W/"1"` | `"1"` | no match | match |
// | `"1"` | `"1"` | match | match |
</span><span class="kw">let </span><span class="kw-2">mut </span>etag1 = EntityTag::new_weak(<span class="string">"1"</span>.to_owned());
<span class="kw">let </span><span class="kw-2">mut </span>etag2 = EntityTag::new_weak(<span class="string">"1"</span>.to_owned());
<span class="macro">assert!</span>(!etag1.strong_eq(<span class="kw-2">&</span>etag2));
<span class="macro">assert!</span>(etag1.weak_eq(<span class="kw-2">&</span>etag2));
<span class="macro">assert!</span>(etag1.strong_ne(<span class="kw-2">&</span>etag2));
<span class="macro">assert!</span>(!etag1.weak_ne(<span class="kw-2">&</span>etag2));
etag1 = EntityTag::new_weak(<span class="string">"1"</span>.to_owned());
etag2 = EntityTag::new_weak(<span class="string">"2"</span>.to_owned());
<span class="macro">assert!</span>(!etag1.strong_eq(<span class="kw-2">&</span>etag2));
<span class="macro">assert!</span>(!etag1.weak_eq(<span class="kw-2">&</span>etag2));
<span class="macro">assert!</span>(etag1.strong_ne(<span class="kw-2">&</span>etag2));
<span class="macro">assert!</span>(etag1.weak_ne(<span class="kw-2">&</span>etag2));
etag1 = EntityTag::new_weak(<span class="string">"1"</span>.to_owned());
etag2 = EntityTag::new_strong(<span class="string">"1"</span>.to_owned());
<span class="macro">assert!</span>(!etag1.strong_eq(<span class="kw-2">&</span>etag2));
<span class="macro">assert!</span>(etag1.weak_eq(<span class="kw-2">&</span>etag2));
<span class="macro">assert!</span>(etag1.strong_ne(<span class="kw-2">&</span>etag2));
<span class="macro">assert!</span>(!etag1.weak_ne(<span class="kw-2">&</span>etag2));
etag1 = EntityTag::new_strong(<span class="string">"1"</span>.to_owned());
etag2 = EntityTag::new_strong(<span class="string">"1"</span>.to_owned());
<span class="macro">assert!</span>(etag1.strong_eq(<span class="kw-2">&</span>etag2));
<span class="macro">assert!</span>(etag1.weak_eq(<span class="kw-2">&</span>etag2));
<span class="macro">assert!</span>(!etag1.strong_ne(<span class="kw-2">&</span>etag2));
<span class="macro">assert!</span>(!etag1.weak_ne(<span class="kw-2">&</span>etag2));
}
}
</code></pre></div></section></main></body></html>