1 files changed, 30 insertions, 0 deletions
diff --git a/src/lib/ContentMetaData.js b/src/lib/ContentMetaData.js
new file mode 100644
index 0000000..c60d75e
--- /dev/null
+++ b/src/lib/ContentMetaData.js
@@ -0,0 +1,30 @@
+class ContentMetaData {
+  constructor(request, defaultCharset = "utf-8") {
+    this.defaultCharset = defaultCharset;
+    let {responseHeaders} = request;
+    for (let h of responseHeaders) {
+      if (/^\s*Content-(Type|Disposition)\s*$/i.test(h.name)) {
+        this[h.name.split("-")[1].trim().toLowerCase()] = h.value;
+      }
+    }
+  }
+
+  get charset() {
+    let charset = this.defaultCharset;
+    if (this.type) {
+      let m = this.type.match(/;\s*charset\s*=\s*(\S+)/);
+      if (m) {
+        charset = m[1];
+      }
+    }
+    Object.defineProperty(this, "charset", { value: charset, writable: false, configurable: true })
+  }
+
+  createDecoder() {
+    try {
+      return new TextDecoder(charset);
+    } catch (e) {
+      return new TextDecoder(this.defaultCharset);
+    }
+  }
+};