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</pre></div><pre class="rust"><code><span class="kw">use </span>std::convert::TryFrom;
<span class="kw">use </span>derive_more::{Display, From};
<span class="doccomment">/// A session key, the string stored in a client-side cookie to associate a user with its session
/// state on the backend.
///
/// # Validation
/// Session keys are stored as cookies, therefore they cannot be arbitrary long. Session keys are
/// required to be smaller than 4064 bytes.
///
/// ```rust
/// # use std::convert::TryInto;
/// use actix_session::storage::SessionKey;
///
/// let key: String = std::iter::repeat('a').take(4065).collect();
/// let session_key: Result<SessionKey, _> = key.try_into();
/// assert!(session_key.is_err());
/// ```
</span><span class="attr">#[derive(Debug, PartialEq, Eq)]
</span><span class="kw">pub struct </span>SessionKey(String);
<span class="kw">impl </span>TryFrom<String> <span class="kw">for </span>SessionKey {
<span class="kw">type </span>Error = InvalidSessionKeyError;
<span class="kw">fn </span>try_from(val: String) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, <span class="self">Self</span>::Error> {
<span class="kw">if </span>val.len() > <span class="number">4064 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="macro">anyhow::anyhow!</span>(
<span class="string">"The session key is bigger than 4064 bytes, the upper limit on cookie content."
</span>)
.into());
}
<span class="prelude-val">Ok</span>(SessionKey(val))
}
}
<span class="kw">impl </span>AsRef<str> <span class="kw">for </span>SessionKey {
<span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str {
<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0
</span>}
}
<span class="kw">impl </span>From<SessionKey> <span class="kw">for </span>String {
<span class="kw">fn </span>from(key: SessionKey) -> <span class="self">Self </span>{
key.<span class="number">0
</span>}
}
<span class="attr">#[derive(Debug, Display, From)]
#[display(fmt = <span class="string">"The provided string is not a valid session key"</span>)]
</span><span class="kw">pub struct </span>InvalidSessionKeyError(anyhow::Error);
<span class="kw">impl </span>std::error::Error <span class="kw">for </span>InvalidSessionKeyError {
<span class="kw">fn </span>source(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>(<span class="kw">dyn </span>std::error::Error + <span class="lifetime">'static</span>)> {
<span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="number">0</span>.as_ref())
}
}
</code></pre></div></section></main></body></html>