1 files changed, 50 insertions, 0 deletions
diff --git a/blog/src/querystring.rs b/blog/src/querystring.rs
new file mode 100644
index 0000000..8bb174a
--- /dev/null
+++ b/blog/src/querystring.rs
@@ -0,0 +1,50 @@
+use std::str;
+use std::collections::HashMap;
+use std::num::ParseIntError;
+
+
+pub fn parse_qs(query: String) -> HashMap<String, String> {
+    let query = percent_decode(query);
+    let mut map = HashMap::new();
+    for pair in query.split('&') {
+        let pair = pair.split('=').collect::<Vec<&str>>();
+        map.insert(pair[0].to_string(), pair[1].to_string());
+    }
+    return map;
+}
+
+fn percent_decode(s: String) -> String {
+    let len = s.len();
+    let mut s = s.chars();
+    let mut result = String::new();
+    let mut decode = String::new();
+
+    let mut i = 0; 
+    while i < len {
+        let cur = s.nth(0).unwrap();
+        if cur == '%' {
+            decode.push(s.nth(0).unwrap());
+            decode.push(s.nth(0).unwrap());
+            i += 3;
+            continue;
+        }
+        if decode.len() != 0 {
+            match decode_hex(&decode) {
+                Ok(v) => result.push_str(str::from_utf8(&v).unwrap()),
+                Err(_) => ()
+            };
+            decode = String::new();
+        }
+
+        result.push(cur);
+        i += 1;
+    }
+    return result;
+}
+
+fn decode_hex(s: &str) -> Result<Vec<u8>, ParseIntError> {
+    (0..s.len())
+        .step_by(2)
+        .map(|i| u8::from_str_radix(&s[i..i + 2], 16))
+        .collect()
+}