Remove unnecessary imports of url_item and add a CSP header-parsing function

The parsing function isn't used yet; however, it will eventually be as a less
destructive alternative to handling headers as indivisible units.

1 files changed, 20 insertions, 0 deletions

diff --git a/common/misc.js b/common/misc.js
index a59ec14..6af2327 100644
--- a/common/misc.js
+++ b/common/misc.js
@@ -154,6 +154,25 @@ function sign_policy(policy, now, hours_offset) {
     return gen_unique(time + policy);
 }
 
+/* Parse a CSP header */
+function parse_csp(csp) {
+    let directive, directive_array;
+    let directives = {};
+    for (directive of csp.split(';')) {
+	directive = directive.trim;
+	if (directive === '')
+	    continue;
+
+	directive_array = directive.split(/\s+/);
+	directive = directive_array.shift();
+	/* The "true" case should never occur; nevertheless... */
+	directives[directive] = directive in directives ?
+	    directives[directive].concat(directive_array) :
+	    directive_array;
+    }
+    return directives;
+}
+
 /*
  * EXPORTS_START
  * EXPORT gen_nonce
@@ -165,5 +184,6 @@ function sign_policy(policy, now, hours_offset) {
  * EXPORT nice_name
  * EXPORT open_in_settings
  * EXPORT is_privileged_url
+ * EXPORT parse_csp
  * EXPORTS_END
  */