1 files changed, 72 insertions, 0 deletions
diff --git a/modules/web/chromium/extensions/inject_extension_key.lua b/modules/web/chromium/extensions/inject_extension_key.lua
new file mode 100644
index 0000000..30ed318
--- /dev/null
+++ b/modules/web/chromium/extensions/inject_extension_key.lua
@@ -0,0 +1,72 @@
+#!/usr/bin/env luajit
+-- inject_extension_key: strip JSON comments and trailing commas from a
+-- manifest, inject the extension's public key, and rewrite it.
+local dkjson = require("dkjson")
+
+local manifest_path = assert(arg[1], "usage: inject_extension_key.lua <manifest> <ext_key>")
+local ext_key = assert(arg[2], "usage: inject_extension_key.lua <manifest> <ext_key>")
+
+local f = assert(io.open(manifest_path, "r"))
+local content = f:read("*a")
+f:close()
+
+-- Hand-rolled scanner that removes // and /* */ comments and mid-JSON
+-- trailing commas while respecting string literals (including escapes).
+local sb = {}
+local i, n = 1, #content
+local in_string = false
+
+local function trim_trailing_comma()
+  while #sb > 0 and (sb[#sb] == " " or sb[#sb] == "\t" or sb[#sb] == "\n" or sb[#sb] == "\r") do
+    sb[#sb] = nil
+  end
+  if #sb > 0 and sb[#sb] == "," then
+    sb[#sb] = nil
+  end
+end
+
+while i <= n do
+  local c = content:sub(i, i)
+  if in_string then
+    sb[#sb + 1] = c
+    if c == "\\" and i < n then
+      sb[#sb + 1] = content:sub(i + 1, i + 1)
+      i = i + 2
+    else
+      if c == '"' then
+        in_string = false
+      end
+      i = i + 1
+    end
+  else
+    local two = content:sub(i, i + 1)
+    if c == '"' then
+      in_string = true
+      sb[#sb + 1] = c
+      i = i + 1
+    elseif two == "//" then
+      local nl = content:find("\n", i) or (n + 1)
+      i = nl
+    elseif two == "/*" then
+      local close = content:find("%*/", i + 2)
+      if not close then
+        break
+      end
+      i = close + 2
+    elseif c == "]" or c == "}" then
+      trim_trailing_comma()
+      sb[#sb + 1] = c
+      i = i + 1
+    else
+      sb[#sb + 1] = c
+      i = i + 1
+    end
+  end
+end
+
+local data = dkjson.decode(table.concat(sb))
+data.key = ext_key
+
+f = assert(io.open(manifest_path, "w"))
+f:write(dkjson.encode(data, { indent = true }))
+f:close()