From 57e4ed2b06d15747b20737bad14bcdd2d73fd8a6 Mon Sep 17 00:00:00 2001
From: jahoti <jahoti@tilde.team>
Date: Wed, 21 Jul 2021 00:00:00 +0000
Subject: 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.
---
 background/policy_injector.js |  1 -
 common/misc.js                | 20 ++++++++++++++++++++
 content/main.js               |  1 -
 3 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/background/policy_injector.js b/background/policy_injector.js
index 01da094..9a994f8 100644
--- a/background/policy_injector.js
+++ b/background/policy_injector.js
@@ -16,7 +16,6 @@
  * IMPORT gen_unique
  * IMPORT gen_nonce
  * IMPORT is_privileged_url
- * IMPORT url_item
  * IMPORT url_extract_target
  * IMPORT sign_policy
  * IMPORT get_query_best
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
  */
diff --git a/content/main.js b/content/main.js
index 8f8375e..9ed557c 100644
--- a/content/main.js
+++ b/content/main.js
@@ -9,7 +9,6 @@
 /*
  * IMPORTS_START
  * IMPORT handle_page_actions
- * IMPORT url_item
  * IMPORT url_extract_target
  * IMPORT gen_unique
  * IMPORT gen_nonce
-- 
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