ci: add simple fuzzing implementation for parser (#73)

Author: pyoor

fuzz/.gitignore

@@ -0,0 +1,4 @@
+target
+corpus
+artifacts
+coverage

fuzz/Cargo.toml

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+[package]
+name = "urlpattern-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+arbitrary = { version = "1", features = ["derive"] }
+regex = "1"
+
+[dependencies.urlpattern]
+path = ".."
+
+[[bin]]
+name = "fuzz_parse"
+path = "fuzz_targets/fuzz_parse.rs"
+test = false
+doc = false
+bench = false

fuzz/fuzz_targets/fuzz_parse.rs

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+#![no_main]
+use urlpattern::{UrlPattern, UrlPatternInit, UrlPatternOptions};
+use libfuzzer_sys::arbitrary::Arbitrary;
+use libfuzzer_sys::fuzz_target;
+
+#[derive(Arbitrary, Debug)]
+struct FuzzInput {
+    protocol: Option<String>,
+    username: Option<String>,
+    password: Option<String>,
+    hostname: Option<String>,
+    port: Option<String>,
+    pathname: Option<String>,
+    search: Option<String>,
+    hash: Option<String>,
+    base_url: Option<String>,
+    ignore_case: bool,
+}
+
+fuzz_target!(|input: FuzzInput| {
+    let init = UrlPatternInit {
+        protocol: input.protocol,
+        username: input.username,
+        password: input.password,
+        hostname: input.hostname,
+        port: input.port,
+        pathname: input.pathname,
+        search: input.search,
+        hash: input.hash,
+        base_url: input.base_url.and_then(|s| s.parse().ok()),
+    };
+    let options = UrlPatternOptions {
+        ignore_case: input.ignore_case,
+    };
+    let _ = UrlPattern::<regex::Regex>::parse(init, options);
+});