show some settings of the current page in the popup

13 files changed, 735 insertions, 128 deletions

diff --git a/background/main.js b/background/main.js
index aec25b6..45fe796 100644
--- a/background/main.js
+++ b/background/main.js
@@ -12,6 +12,7 @@
  * IMPORT start_storage_server
  * IMPORT start_page_actions_server
  * IMPORT start_policy_injector
+ * IMPORT start_page_info_server
  * IMPORT browser
  * IMPORTS_END
  */
@@ -19,6 +20,7 @@
 start_storage_server();
 start_page_actions_server();
 start_policy_injector();
+start_page_info_server();
 
 async function init_myext(install_details)
 {
diff --git a/background/page_actions_server.js b/background/page_actions_server.js
index f9773f6..2d9c333 100644
--- a/background/page_actions_server.js
+++ b/background/page_actions_server.js
@@ -21,9 +21,12 @@ var storage;
 var query_best;
 var handler;
 
-function send_scripts(url, port)
+function send_actions(url, port)
 {
     let [pattern, settings] = query_best(url);
+
+    port.postMessage(["settings", [pattern, settings]]);
+
     if (settings === undefined)
 	return;
 
@@ -31,11 +34,11 @@ function send_scripts(url, port)
     let processed_bags = new Set();
 
     if (components !== undefined)
-	send_scripts_rec([components], port, processed_bags);
+	send_scripts([components], port, processed_bags);
 }
 
 // TODO: parallelize script fetching
-async function send_scripts_rec(components, port, processed_bags)
+async function send_scripts(components, port, processed_bags)
 {
     for (let [prefix, name] of components) {
 	if (prefix === TYPE_PREFIX.BAG) {
@@ -52,14 +55,15 @@ async function send_scripts_rec(components, port, processed_bags)
 	    }
 
 	    processed_bags.add(name);
-	    await send_scripts_rec(bag, port, processed_bags);
+	    await send_scripts(bag, port, processed_bags);
+
 	    processed_bags.delete(name);
 	} else {
 	    let script_text = await get_script_text(name);
 	    if (script_text === undefined)
 		continue;
 
-	    port.postMessage({inject : [script_text]});
+	    port.postMessage(["inject", [script_text]]);
 	}
     }
 }
@@ -127,7 +131,7 @@ function handle_message(port, message, handler)
     port.onMessage.removeListener(handler[0]);
     let url = message.url;
     console.log({url});
-    send_scripts(url, port);
+    send_actions(url, port);
 }
 
 function new_connection(port)
diff --git a/background/page_info_server.js b/background/page_info_server.js
new file mode 100644
index 0000000..49919fd
--- /dev/null
+++ b/background/page_info_server.js
@@ -0,0 +1,77 @@
+/**
+ * part of Hachette
+ * Serving of storage data corresponding to requested urls (server side).
+ *
+ * Copyright (C) 2021 Wojtek Kosior
+ * Redistribution terms are gathered in the `copyright' file.
+ */
+
+/*
+ * IMPORTS_START
+ * IMPORT listen_for_connection
+ * IMPORT get_storage
+ * IMPORT get_query_all
+ * IMPORT TYPE_PREFIX
+ * IMPORT CONNECTION_TYPE
+ * IMPORT url_matches
+ * IMPORTS_END
+ */
+
+var storage;
+var query_all;
+
+function handle_change(connection_data, change)
+{
+    if (change.prefix !== TYPE_PREFIX.PAGE)
+	return;
+
+    connection_data.port.postMessage(["change", change]);
+}
+
+async function handle_subscription(connection_data, message)
+{
+    const [action, url] = message;
+    if (action === "unsubscribe") {
+	connection_data.subscribed.delete(url);
+	return;
+    }
+
+    connection_data.subscribed.add(url);
+    connection_data.port.postMessage(["new_url", query_all(url)]);
+}
+
+function remove_storage_listener(cb)
+{
+    storage.remove_change_listener(cb);
+}
+
+function new_connection(port)
+{
+    console.log("new page info connection!");
+
+    const connection_data = {
+	subscribed : new Set(),
+	port
+    };
+
+    let _handle_change = change => handle_change(connection_data, change);
+
+    storage.add_change_listener(_handle_change);
+
+    port.onMessage.addListener(m => handle_subscription(connection_data, m));
+    port.onDisconnect.addListener(() => remove_storage_listener(handle_change));
+}
+
+async function start_page_info_server()
+{
+    storage = await get_storage();
+    query_all = await get_query_all();
+
+    listen_for_connection(CONNECTION_TYPE.PAGE_INFO, new_connection);
+}
+
+/*
+ * EXPORTS_START
+ * EXPORT start_page_info_server
+ * EXPORTS_END
+ */
diff --git a/background/settings_query.js b/background/settings_query.js
index ce01b80..d509b09 100644
--- a/background/settings_query.js
+++ b/background/settings_query.js
@@ -10,13 +10,12 @@
  * IMPORT make_once
  * IMPORT get_storage
  * IMPORT TYPE_PREFIX
+ * IMPORT for_each_possible_pattern
  * IMPORTS_END
  */
 
 var storage;
 
-var exports = {};
-
 async function init(fun)
 {
     storage = await get_storage();
@@ -24,94 +23,25 @@ async function init(fun)
     return fun;
 }
 
-// TODO: also support urls with specified ports
-function query(url, multiple)
+function check_pattern(pattern, multiple, matched)
 {
-    let proto_re = "[a-zA-Z]*:\/\/";
-    let domain_re = "[^/?#]+";
-    let segments_re = "/[^?#]*";
-    let query_re = "\\?[^#]*";
-
-    let url_regex = new RegExp(`\
-^\
-(${proto_re})\
-(${domain_re})\
-(${segments_re})?\
-(${query_re})?\
-#?.*\$\
-`);
-
-    let regex_match = url_regex.exec(url);
-    if (regex_match === null) {
-	console.log("bad url format", url);
-	return multiple ? [] : [undefined, undefined];
-    }
-
-    let [_, proto, domain, segments, query] = regex_match;
-
-    domain = domain.split(".");
-    let segments_trailing_dash =
-	segments && segments[segments.length - 1] === "/";
-    segments = (segments || "").split("/").filter(s => s !== "");
-    segments.unshift("");
-
-    let matched = [];
+    const settings = storage.get(TYPE_PREFIX.PAGE, pattern);
 
-    for (let d_slice = 0; d_slice < domain.length; d_slice++) {
-	let domain_part = domain.slice(d_slice).join(".");
-	let domain_wildcards = [];
-	if (d_slice === 0)
-	    domain_wildcards.push("");
-	if (d_slice === 1)
-	    domain_wildcards.push("*.");
-	if (d_slice > 0)
-	    domain_wildcards.push("**.");
-	domain_wildcards.push("***.");
+    if (settings === undefined)
+	return;
 
-	for (let domain_wildcard of domain_wildcards) {
-	    let domain_pattern = domain_wildcard + domain_part;
+    matched.push([pattern, settings]);
 
-	    for (let s_slice = segments.length; s_slice > 0; s_slice--) {
-		let segments_part = segments.slice(0, s_slice).join("/");
-		let segments_wildcards = [];
-		if (s_slice === segments.length) {
-		    if (segments_trailing_dash)
-			segments_wildcards.push("/");
-		    segments_wildcards.push("");
-		}
-		if (s_slice === segments.length - 1) {
-		    if (segments[s_slice] !== "*")
-			segments_wildcards.push("/*");
-		}
-		if (s_slice < segments.length &&
-		    (segments[s_slice] !== "**" ||
-		     s_slice < segments.length - 1))
-		    segments_wildcards.push("/**");
-		if (segments[s_slice] !== "***" ||
-		    s_slice < segments.length)
-		    segments_wildcards.push("/***");
-
-		for (let segments_wildcard of segments_wildcards) {
-		    let segments_pattern =
-			segments_part + segments_wildcard;
-
-		    let pattern = proto + domain_pattern + segments_pattern;
-		    console.log("trying", pattern);
-		    let settings = storage.get(TYPE_PREFIX.PAGE, pattern);
-
-		    if (settings === undefined)
-			continue;
-
-		    if (!multiple)
-			return [pattern, settings];
+    if (!multiple)
+	return false;
+}
 
-		    matched.push([pattern, settings]);
-		}
-	    }
-	}
-    }
+function query(url, multiple)
+{
+    const matched = [];
+    for_each_possible_pattern(url, p => check_pattern(p, multiple, matched));
 
-    return multiple ?  matched : [undefined, undefined];
+    return multiple ? matched : (matched[0] || [undefined, undefined]);
 }
 
 function query_best(url)
diff --git a/common/connection_types.js b/common/connection_types.js
index e227532..ce63e55 100644
--- a/common/connection_types.js
+++ b/common/connection_types.js
@@ -12,7 +12,9 @@
 
 const CONNECTION_TYPE = {
     REMOTE_STORAGE : "0",
-    PAGE_ACTIONS : "1"
+    PAGE_ACTIONS : "1",
+    PAGE_INFO : "2",
+    ACTIVITY_INFO : "3"
 };
 
 /*
diff --git a/common/misc.js b/common/misc.js
index 0a3a425..8b56e79 100644
--- a/common/misc.js
+++ b/common/misc.js
@@ -10,6 +10,7 @@
  * IMPORT sha256
  * IMPORT browser
  * IMPORT is_chrome
+ * IMPORT TYPE_NAME
  * IMPORTS_END
  */
 
@@ -72,10 +73,36 @@ function csp_rule(nonce)
 }
 
 /*
+ * Print item together with type, e.g.
+ * nice_name("s", "hello") → "hello (script)"
+ */
+function nice_name(prefix, name)
+{
+    return `${name} (${TYPE_NAME[prefix]})`;
+}
+
+/* Open settings tab with given item's editing already on. */
+function open_in_settings(prefix, name)
+{
+    name = encodeURIComponent(name);
+    const url = browser.runtime.getURL("html/options.html#" + prefix + name);
+    window.open(url, "_blank");
+}
+
+/* Check if url corresponds to a browser's special page */
+function is_privileged_url(url)
+{
+    return !!/^(chrome(-extension)?|moz-extension):\/\/|^about:/i.exec(url);
+}
+
+/*
  * EXPORTS_START
  * EXPORT gen_unique
  * EXPORT url_item
  * EXPORT url_extract_target
  * EXPORT csp_rule
+ * EXPORT nice_name
+ * EXPORT open_in_settings
+ * EXPORT is_privileged_url
  * EXPORTS_END
  */
diff --git a/common/patterns.js b/common/patterns.js
new file mode 100644
index 0000000..f7da0ff
--- /dev/null
+++ b/common/patterns.js
@@ -0,0 +1,187 @@
+/**
+ * Hydrilla/Lernette operations on page url patterns
+ *
+ * Copyright (C) 2021 Wojtek Kosior
+ * Redistribution terms are gathered in the `copyright' file.
+ */
+
+const proto_re = "[a-zA-Z]*:\/\/";
+const domain_re = "[^/?#]+";
+const segments_re = "/[^?#]*";
+const query_re = "\\?[^#]*";
+
+const url_regex = new RegExp(`\
+^\
+(${proto_re})\
+(${domain_re})\
+(${segments_re})?\
+(${query_re})?\
+#?.*\$\
+`);
+
+function deconstruct_url(url)
+{
+    const regex_match = url_regex.exec(url);
+    if (regex_match === null)
+	return undefined;
+
+    let [_, proto, domain, path, query] = regex_match;
+
+    domain = domain.split(".");
+    let path_trailing_dash =
+	path && path[path.length - 1] === "/";
+    path = (path || "").split("/").filter(s => s !== "");
+    path.unshift("");
+
+    return {proto, domain, path, query, path_trailing_dash};
+}
+
+/* Be sane: both arguments should be arrays of length >= 2 */
+function domain_matches(url_domain, pattern_domain)
+{
+    const length_difference = url_domain.length - pattern_domain.length;
+
+    for (let i = 1; i <= url_domain.length; i++) {
+	const url_part = url_domain[url_domain.length - i];
+	const pattern_part = pattern_domain[pattern_domain.length - i];
+
+	if (pattern_domain.length === i) {
+	    if (pattern_part === "*")
+		return length_difference === 0;
+	    if (pattern_part === "**")
+		return length_difference > 0;
+	    if (pattern_part === "***")
+		return true;
+	    return length_difference === 0 && pattern_part === url_part;
+	}
+
+	if (pattern_part !== url_part)
+	    return false;
+    }
+
+    return pattern_domain.length === url_domain.length + 1 &&
+	pattern_domain[0] === "***";
+}
+
+function path_matches(url_path, url_trailing_dash,
+		      pattern_path, pattern_trailing_dash)
+{
+    const dashes_ok = !(pattern_trailing_dash && !url_trailing_dash);
+
+    if (pattern_path.length === 0)
+	return url_path.length === 0 && dashes_ok;
+
+    const length_difference = url_path.length - pattern_path.length;
+
+    for (let i = 0; i < url_path.length; i++) {
+	if (pattern_path.length === i + 1) {
+	    if (pattern_path[i] === "*")
+		return length_difference === 0;
+	    if (pattern_path[i] === "**") {
+		return length_difference > 0 ||
+		    (url_path[i] === "**" && dashes_ok);
+	    }
+	    if (pattern_path[i] === "***")
+		return length_difference >= 0;
+	    return length_difference === 0 &&
+		pattern_path[i] === url_path[i] && dashes_ok;
+	}
+
+	if (pattern_path[i] !== url_path[i])
+	    return false;
+    }
+
+    return false;
+}
+
+function url_matches(url, pattern)
+{
+    const url_deco = deconstruct_url(url);
+    const pattern_deco = deconstruct_url(pattern);
+
+    if (url_deco === undefined || pattern_deco === undefined) {
+	console.log(`bad comparison: ${url} and ${pattern}`);
+	return false
+    }
+
+    if (pattern_deco.proto !== url_deco.proto)
+	return false;
+
+    return domain_matches(url_deco.domain, pattern_deco.domain) &&
+	path_matches(url_deco.path, url_deco.path_trailing_dash,
+		     pattern_deco.path, pattern_deco.path_trailing_dash);
+}
+
+/*
+ * Call callback for every possible pattern that matches url. Return when there
+ * are no more patterns or callback returns false.
+ */
+function for_each_possible_pattern(url, callback)
+{
+    const deco = deconstruct_url(url);
+
+    if (deco === undefined) {
+	console.log("bad url format", url);
+	return;
+    }
+
+    for (let d_slice = 0; d_slice < deco.domain.length; d_slice++) {
+	const domain_part = deco.domain.slice(d_slice).join(".");
+	const domain_wildcards = [];
+	if (d_slice === 0)
+	    domain_wildcards.push("");
+	if (d_slice === 1)
+	    domain_wildcards.push("*.");
+	if (d_slice > 0)
+	    domain_wildcards.push("**.");
+	domain_wildcards.push("***.");
+
+	for (const domain_wildcard of domain_wildcards) {
+	    const domain_pattern = domain_wildcard + domain_part;
+
+	    for (let s_slice = deco.path.length; s_slice > 0; s_slice--) {
+		const path_part = deco.path.slice(0, s_slice).join("/");
+		const path_wildcards = [];
+		if (s_slice === deco.path.length) {
+		    if (deco.path_trailing_dash)
+			path_wildcards.push("/");
+		    path_wildcards.push("");
+		}
+		if (s_slice === deco.path.length - 1 &&
+		    deco.path[s_slice] !== "*")
+		    path_wildcards.push("/*");
+		if (s_slice < deco.path.length &&
+		    (deco.path[s_slice] !== "**" ||
+		     s_slice < deco.path.length - 1))
+		    path_wildcards.push("/**");
+		if (deco.path[s_slice] !== "***" || s_slice < deco.path.length)
+		    path_wildcards.push("/***");
+
+		for (const path_wildcard of path_wildcards) {
+		    const path_pattern = path_part + path_wildcard;
+
+		    const pattern = deco.proto + domain_pattern + path_pattern;
+
+		    if (callback(pattern) === false)
+			return;
+		}
+	    }
+	}
+    }
+}
+
+function possible_patterns(url)
+{
+    const patterns = [];
+    for_each_possible_pattern(url, patterns.push);
+
+    return patterns;
+}
+
+/*
+ * EXPORTS_START
+ * EXPORT url_matches
+ * EXPORT for_each_possible_pattern
+ * EXPORT possible_patterns
+ * EXPORTS_END
+ */
diff --git a/content/activity_info_server.js b/content/activity_info_server.js
new file mode 100644
index 0000000..8435377
--- /dev/null
+++ b/content/activity_info_server.js
@@ -0,0 +1,60 @@
+/**
+ * part of Hachette
+ * Informing about activities performed by content script (script injection,
+ * script blocking).
+ *
+ * Copyright (C) 2021 Wojtek Kosior
+ * Redistribution terms are gathered in the `copyright' file.
+ */
+
+/*
+ * IMPORTS_START
+ * IMPORT listen_for_connection
+ * IMPORT CONNECTION_TYPE
+ * IMPORTS_END
+ */
+
+var activities = [];
+var ports = new Set();
+
+function report_activity(name, data)
+{
+    const activity = [name, data];
+    activities.push(activity);
+
+    for (const port of ports)
+	port.postMessage(activity);
+}
+
+function report_script(script_data)
+{
+    report_activity("script", script_data);
+}
+
+function report_settings(settings)
+{
+    report_activity("settings", settings);
+}
+
+function new_connection(port)
+{
+    console.log("new activity info connection!");
+
+    ports.add(port);
+
+    for (const activity of activities)
+	port.postMessage(activity);
+}
+
+function start_activity_info_server()
+{
+    listen_for_connection(CONNECTION_TYPE.ACTIVITY_INFO, new_connection);
+}
+
+/*
+ * EXPORTS_START
+ * EXPORT start_activity_info_server
+ * EXPORT report_script
+ * EXPORT report_settings
+ * EXPORTS_END
+ */
diff --git a/content/main.js b/content/main.js
index 65ac008..5d88a6d 100644
--- a/content/main.js
+++ b/content/main.js
@@ -12,10 +12,12 @@
  * IMPORT url_extract_target
  * IMPORT gen_unique
  * IMPORT csp_rule
+ * IMPORT is_privileged_url
  * IMPORT sanitize_attributes
  * IMPORT script_suppressor
  * IMPORT is_chrome
  * IMPORT is_mozilla
+ * IMPORT start_activity_info_server
  * IMPORTS_END
  */
 
@@ -35,11 +37,14 @@ let unique = gen_unique(url);
 
 const suppressor = script_suppressor(unique);
 
-function needs_blocking()
+
+function is_http()
 {
-    if (url.startsWith("https://") || url.startsWith("http://"))
-	return false;
+    return !!/^https?:\/\//i.exec(document.URL);
+}
 
+function is_whitelisted()
+{
     const parsed_url = url_extract_target(document.URL);
 
     if (parsed_url.target !== undefined &&
@@ -49,12 +54,10 @@ function needs_blocking()
 	else
 	    history.replaceState(null, "", parsed_url.base_url);
 
-	console.log(["allowing whitelisted", document.URL]);
-	return false;
+	return true;
     }
 
-    console.log(["disallowing", document.URL]);
-    return true;
+    return false;
 }
 
 function handle_mutation(mutations, observer)
@@ -120,20 +123,27 @@ function inject_csp(head)
 	head.insertBefore(meta, head.firstElementChild);
 }
 
-if (needs_blocking()) {
-    block_nodes_recursively(document.documentElement);
-
-    if (is_chrome) {
-	var observer = new MutationObserver(handle_mutation);
-	observer.observe(document.documentElement, {
-	    attributes: true,
-	    childList: true,
-	    subtree: true
-	});
+if (!is_privileged_url(document.URL)) {
+    start_activity_info_server();
+    handle_page_actions(unique);
+
+    if (is_http()) {
+	/* rely on CSP injected through webRequest */
+    } else if (is_whitelisted()) {
+	/* do not block scripts at all */
+    } else {
+	block_nodes_recursively(document.documentElement);
+
+	if (is_chrome) {
+	    var observer = new MutationObserver(handle_mutation);
+	    observer.observe(document.documentElement, {
+		attributes: true,
+		childList: true,
+		subtree: true
+	    });
+	}
+
+	if (is_mozilla)
+	    addEventListener('beforescriptexecute', suppressor, true);
     }
-
-    if (is_mozilla)
-	addEventListener('beforescriptexecute', suppressor, true);
 }
-
-handle_page_actions(unique);
diff --git a/content/page_actions.js b/content/page_actions.js
index bc65449..fd405fe 100644
--- a/content/page_actions.js
+++ b/content/page_actions.js
@@ -9,6 +9,8 @@
  * IMPORTS_START
  * IMPORT CONNECTION_TYPE
  * IMPORT browser
+ * IMPORT report_script
+ * IMPORT report_settings
  * IMPORTS_END
  */
 
@@ -19,15 +21,18 @@ var nonce;
 
 function handle_message(message)
 {
-    if (message.inject === undefined)
-	return;
+    const [action, data] = message;
 
-    for (let script_text of message.inject) {
-	if (loaded)
-	    add_script(script_text);
-	else
-	    scripts_awaiting.push(script_text);
+    if (action === "inject") {
+	for (let script_text of data) {
+	    if (loaded)
+		add_script(script_text);
+	    else
+		scripts_awaiting.push(script_text);
+	}
     }
+    if (action === "settings")
+	report_settings(data);
 }
 
 function document_loaded(event)
@@ -46,6 +51,8 @@ function add_script(script_text)
     script.textContent = script_text;
     script.setAttribute("nonce", nonce);
     document.body.appendChild(script);
+
+    report_script(script_text);
 }
 
 function handle_page_actions(script_nonce) {
diff --git a/html/display-panel.html b/html/display-panel.html
index 5e5580e..9b6d619 100644
--- a/html/display-panel.html
+++ b/html/display-panel.html
@@ -6,9 +6,90 @@
 <html>
   <head>
     <meta charset="utf-8"/>
-    <title>Myext popup</title>
+    <title>Hachette - page settings</title>
+    <style>
+      input[type="radio"], input[type="checkbox"] {
+	  display: none;
+      }
+
+      body {
+	  width: 300px;
+	  height: 300px;
+      }
+
+      .show_next:not(:checked)+* {
+	  display: none;
+      }
+
+      .hide {
+	  display: none;
+      }
+
+      #possible_patterns_chbx:not(:checked)+label span#triangle:first-child+span,
+      #possible_patterns_chbx:not(:checked)+label+*,
+      #possible_patterns_chbx:checked+label span#triangle:first-child {
+	  display: none;
+      }
+
+      #container_for_injected>#none_injected:not(:last-child) {
+	  display: none;
+      }
+
+      input#connected_chbx:checked+div+h3 {
+	  display: none;
+      }
+    </style>
   </head>
   <body>
-    <button id="settings_but" type="button">Settings</button>_POPUPSCRIPTS_
+    <!-- The invisible div below is for elements that will be cloned. -->
+    <div class="hide">
+      <li id="pattern_li_template">
+	<span></span>
+	<button>View in settings</button>
+      </li>
+    </div>
+
+    <h2 id="page_url_heading"></h2>
+
+    <input id="show_privileged_notice_chbx" type="checkbox" class="show_next"></input>
+    <h3>Privileged page</h3>
+
+    <input id="show_page_state_chbx" type="checkbox" class="show_next"></input>
+    <div>
+      <input id="possible_patterns_chbx" type="checkbox"></input>
+      <label for="possible_patterns_chbx">
+	<h3>
+	  <span id="triangle">&#x23F5;</span><span>&#x23F7;</span>
+	  Possible patterns
+	</h3>
+      </label>
+      <ul id="possible_patterns"></ul>
+
+      <input id="connected_chbx" type="checkbox" class="show_next"></input>
+      <div>
+	<h3>
+	  Matched pattern: <span id="pattern">...</span>
+	  <button id="view_pattern" class="hide">
+	  View in settings
+	  </button>
+	</h3>
+	<h3>
+	  Blocked: <span id="blocked">...</span>
+	</h3>
+	<h3>
+	  Payload: <span id="payload">...</span>
+	  <button id="view_payload" class="hide">
+	    View in settings
+	  </button>
+	</h3>
+	<h3>Injected</h3>
+	<div id="container_for_injected">
+	  <span id="none_injected">None</span>
+	</div>
+      </div>
+      <h3>Trying to connect..<input id="loading_chbx" type="checkbox" class="show_next"></input><span>.</span></h3>
+    </div>
+
+    <button id="settings_but" type="button" style="margin-top: 20px;">Settings</button>_POPUPSCRIPTS_
   </body>
 </html>
diff --git a/html/display-panel.js b/html/display-panel.js
index 4a4cdcd..9ae35fd 100644
--- a/html/display-panel.js
+++ b/html/display-panel.js
@@ -8,8 +8,232 @@
 /*
  * IMPORTS_START
  * IMPORT browser
+ * IMPORT is_chrome
+ * IMPORT is_mozilla
+ * IMPORT CONNECTION_TYPE
+ * IMPORT url_item
+ * IMPORT is_privileged_url
+ * IMPORT TYPE_PREFIX
+ * IMPORT nice_name
+ * IMPORT open_in_settings
+ * IMPORT for_each_possible_pattern
  * IMPORTS_END
  */
 
-document.getElementById("settings_but")
+function by_id(id)
+{
+    return document.getElementById(id);
+}
+
+const tab_query = {currentWindow: true, active: true};
+
+async function get_current_tab()
+{
+    /* Fix for fact that Chrome does not use promises here */
+    const promise = is_chrome ?
+	  new Promise((resolve, reject) =>
+		      browser.tabs.query(tab_query, tab => resolve(tab))) :
+	  browser.tabs.query(tab_query);
+
+    try {
+	return (await promise)[0];
+    } catch(e) {
+	console.log(e);
+    }
+}
+
+const page_url_heading = by_id("page_url_heading");
+const show_privileged_notice_chbx = by_id("show_privileged_notice_chbx");
+const show_page_state_chbx = by_id("show_page_state_chbx");
+
+async function show_page_activity_info()
+{
+    const tab = await get_current_tab();
+
+    if (tab === undefined) {
+	page_url_heading.textContent = "unknown page";
+	return;
+    }
+
+    const url = url_item(tab.url);
+    page_url_heading.textContent = url;
+    if (is_privileged_url(url)) {
+	show_privileged_notice_chbx.checked = true;
+	return;
+    }
+
+    populate_possible_patterns_list(url);
+    show_page_state_chbx.checked = true;
+
+    try_to_connect(tab.id);
+}
+
+function populate_possible_patterns_list(url)
+{
+    for_each_possible_pattern(url, add_pattern_to_list);
+
+    const port = browser.runtime.connect({name: CONNECTION_TYPE.PAGE_INFO});
+    port.onMessage.addListener(handle_page_info);
+    port.postMessage(["subscribe", url]);
+}
+
+const possible_patterns_ul = by_id("possible_patterns");
+const pattern_li_template = by_id("pattern_li_template");
+pattern_li_template.removeAttribute("id");
+const known_patterns = new Map();
+
+function add_pattern_to_list(pattern)
+{
+    const li = pattern_li_template.cloneNode(true);
+    li.id = `pattern_li_${known_patterns.size}`;
+    known_patterns.set(pattern, li.id);
+
+    const span = li.firstElementChild;
+    span.textContent = pattern;
+
+    const button = span.nextElementSibling;
+    const settings_opener = () => open_in_settings(TYPE_PREFIX.PAGE, pattern);
+    button.addEventListener("click", settings_opener);
+
+    possible_patterns_ul.appendChild(li)
+
+    return li.id;
+}
+
+function ensure_pattern_exists(pattern)
+{
+    let id = known_patterns.get(pattern);
+    /*
+     * As long as pattern computation works well, we should never get into this
+     * conditional block. This is just a safety measure. To be removed as part
+     * of a bigger rework when we start taking iframes into account.
+     */
+    if (id === undefined) {
+	console.log(`unknown pattern: ${pattern}`);
+	id = add_pattern_to_list(pattern);
+    }
+
+    return id;
+}
+
+function set_pattern_li_button_text(li_id, text)
+{
+    by_id(li_id).firstElementChild.nextElementSibling.textContent = text;
+}
+
+function handle_page_info(message)
+{
+    const [type, data] = message;
+
+    if (type === "change") {
+	const li_id = ensure_pattern_exists(data.item);
+	if (data.old_val === undefined)
+	    set_pattern_li_button_text(li_id, "Edit in settings");
+	if (data.new_val === undefined)
+	    set_pattern_li_button_text(li_id, "Add setting");
+    }
+
+    if (type === "new_url") {
+	for (const li_id of known_patterns.values())
+	    set_pattern_li_button_text(li_id, "Add setting");
+	for (const [pattern, settings] of data) {
+	    set_pattern_li_button_text(ensure_pattern_exists(pattern),
+				       "Edit in settings")
+	}
+    }
+}
+
+const connected_chbx = by_id("connected_chbx");
+
+function try_to_connect(tab_id)
+{
+    /* This won't connect to iframes. We'll add support for them later */
+    const connect_info = {name: CONNECTION_TYPE.ACTIVITY_INFO, frameId: 0};
+    const port = browser.tabs.connect(tab_id, connect_info);
+
+    port.onDisconnect.addListener(port => handle_disconnect(tab_id));
+    port.onMessage.addListener(handle_activity_report);
+
+    if (is_mozilla)
+	setTimeout(() => monitor_connecting(port, tab_id), 1000);
+}
+
+const loading_chbx = by_id("loading_chbx");
+
+function handle_disconnect(tab_id)
+{
+    if (is_chrome && !browser.runtime.lastError)
+	return;
+
+    /* return if there was no connection initialization failure */
+    if (connected_chbx.checked)
+	return;
+
+    loading_chbx.checked = !loading_chbx.checked;
+    setTimeout(() => try_to_connect(tab_id), 1000);
+}
+
+function monitor_connecting(port, tab_id)
+{
+    if (connected_chbx.checked)
+	return;
+
+    port.disconnect();
+    loading_chbx.checked = !loading_chbx.checked;
+    try_to_connect(tab_id);
+}
+
+const pattern_span = by_id("pattern");
+const view_pattern_but = by_id("view_pattern");
+const blocked_span = by_id("blocked");
+const payload_span = by_id("payload");
+const view_payload_but = by_id("view_payload");
+const container_for_injected = by_id("container_for_injected");
+
+function handle_activity_report(message)
+{
+    connected_chbx.checked = true;
+
+    const [type, data] = message;
+
+    if (type === "settings") {
+	let [pattern, settings] = data;
+
+	settings = settings || {};
+	blocked_span.textContent = settings.allow ? "no" : "yes";
+
+	if (pattern) {
+	    pattern_span.textContent = pattern;
+	    const settings_opener =
+		  () => open_in_settings(TYPE_PREFIX.PAGE, pattern);
+	    view_pattern_but.classList.remove("hide");
+	    view_pattern_but.addEventListener("click", settings_opener);
+	} else {
+	    pattern_span.textContent = "none";
+	}
+
+	const components = settings.components;
+	if (components) {
+	    payload_span.textContent = nice_name(...components);
+	    const settings_opener = () => open_in_settings(...components);
+	    view_payload_but.classList.remove("hide");
+	    view_payload_but.addEventListener("click", settings_opener);
+	} else {
+	    payload_span.textContent = "none";
+	}
+    }
+    if (type === "script") {
+	const h4 = document.createElement("h4");
+	const pre = document.createElement("pre");
+	h4.textContent = "script";
+	pre.textContent = data;
+
+	container_for_injected.appendChild(h4);
+	container_for_injected.appendChild(pre);
+    }
+}
+
+by_id("settings_but")
     .addEventListener("click", (e) => browser.runtime.openOptionsPage());
+
+show_page_activity_info();
diff --git a/html/options_main.js b/html/options_main.js
index 9c66a27..f7adf39 100644
--- a/html/options_main.js
+++ b/html/options_main.js
@@ -12,6 +12,7 @@
  * IMPORT TYPE_NAME
  * IMPORT list_prefixes
  * IMPORT url_extract_target
+ * IMPORT nice_name
  * IMPORTS_END
  */
 
@@ -21,11 +22,6 @@ function by_id(id)
     return document.getElementById(id);
 }
 
-function nice_name(prefix, name)
-{
-    return `${name} (${TYPE_NAME[prefix]})`;
-}
-
 const item_li_template = by_id("item_li_template");
 const bag_component_li_template = by_id("bag_component_li_template");
 const chbx_component_li_template = by_id("chbx_component_li_template");