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Packages/com.tivadar.best.http/Runtime/HTTP/Request/Authentication/WWWAuthenticateHeaderParser.cs

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+using System.Collections.Generic;
+
+using Best.HTTP.Shared.Extensions;
+
+namespace Best.HTTP.Request.Authentication
+{
+    /// <summary>
+    /// Used for parsing WWW-Authenticate headers:
+    /// `Digest realm="my realm", nonce="4664b327a2963503ba58bbe13ad672c0", qop=auth, opaque="f7e38bdc1c66fce214f9019ffe43117c"`
+    /// </summary>
+    public sealed class WWWAuthenticateHeaderParser : KeyValuePairList
+    {
+        public WWWAuthenticateHeaderParser(string headerValue)
+        {
+            Values = ParseQuotedHeader(headerValue);
+        }
+
+        private List<HeaderValue> ParseQuotedHeader(string str)
+        {
+            List<HeaderValue> result = new List<HeaderValue>();
+
+            if (str != null)
+            {
+
+                int idx = 0;
+
+                // Read Type (Basic|Digest)
+                string type = str.Read(ref idx, (ch) => !char.IsWhiteSpace(ch) && !char.IsControl(ch)).TrimAndLower();
+                result.Add(new HeaderValue(type));
+
+                // process the rest of the text
+                while (idx < str.Length)
+                {
+                    // Read key
+                    string key = str.Read(ref idx, '=').TrimAndLower();
+                    HeaderValue qp = new HeaderValue(key);
+
+                    // Skip any white space
+                    str.SkipWhiteSpace(ref idx);
+
+                    qp.Value = str.ReadPossibleQuotedText(ref idx);
+
+                    result.Add(qp);
+                }
+            }
+            return result;
+        }
+    }
+}