Support attachements in metadata fields (fixes #77)
Change-Id: Ia5be6ec851ef318d89b115ac814663dc32da3484
diff --git a/dev/js/src/match/attachement.js b/dev/js/src/match/attachement.js
new file mode 100644
index 0000000..4548703
--- /dev/null
+++ b/dev/js/src/match/attachement.js
@@ -0,0 +1,86 @@
+/**
+ * Parse Data URI scheme for attachement fields
+ * Afterwards the object has the parameters
+ * - contentType (defaults to text/plain)
+ * - base64 (if the data was base64 encoded)
+ * - isLink (if the contentType is application/x.korap-link)
+ * - param (as a map of arbitrary parameters)
+ * - payload (the URI decoded data)
+ *
+ * @author Nils Diewald
+ */
+define(function () {
+ const uriRE = new RegExp("^data: *([^;,]+?(?: *; *[^,;]+?)*) *, *(.+)$");
+ const mapRE = new RegExp("^ *([^=]+?) *= *(.+?) *$");
+
+ return {
+
+ /**
+ * Constructor
+ */
+ create : function (url) {
+ return Object.create(this)._init(url);
+ },
+
+ // Parse URI scheme
+ _init : function (url) {
+
+ // Decode
+ url = decodeURIComponent(url);
+
+ if (!uriRE.exec(url))
+ return;
+
+ this.payload = RegExp.$2;
+
+ let map = {};
+ let start = 0;
+ this.base64 = false;
+ this.isLink = false;
+ this.contentType = "text/plain";
+
+ // Split parameter map
+ RegExp.$1.split(/ *; */).map(function (item) {
+
+ // Check first parameter
+ if (!start++ && item.match(/^[-a-z0-9]+?\/.+$/)) {
+ this.contentType = item;
+
+ if (item === "application/x.korap-link")
+ this.isLink = true;
+ }
+
+ // Decode b64
+ else if (item.toLowerCase() == "base64") {
+ this.base64 = true;
+ this.payload = window.atob(this.payload);
+ }
+
+ // Parse arbitrary metadata
+ else if (mapRE.exec(item)) {
+ map[RegExp.$1] = RegExp.$2;
+ };
+ }.bind(this));
+
+ this.param = map;
+ return this;
+ },
+
+ /**
+ * Inline the attachement
+ * This should optimally be plugin-treatable
+ */
+ inline : function () {
+ if (this.isLink) {
+ let title = this.param["title"] || this.payload;
+ let a = document.createElement('a');
+ a.setAttribute('href', this.payload);
+ a.setAttribute('rel', 'noopener noreferrer');
+ a.addT(title);
+ return a;
+ };
+
+ return document.createTextNode(this.payload);
+ }
+ }
+});