From: Andrew Lorimer <andrew@lorimer.id.au>
Date: Tue, 20 Aug 2019 08:23:52 +0000 (+1000)
Subject: add build system
X-Git-Url: https://git.lorimer.id.au/newtab.git/diff_plain/75a6e6c15d2e6710a4cf9a253ba8d55adde7d9dc

add build system
---

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..0c1d375
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,8 @@
+TARGETS := extension
+.PHONY: all clean
+
+all: $(TARGETS)
+clean:
+	rm build/*.crx
+extension:
+	./build.sh -s src -p newtab.pem -d build/newtab.crx
diff --git a/README.md b/README.md
index c557cdc..9b4e7aa 100644
--- a/README.md
+++ b/README.md
@@ -32,4 +32,4 @@ Opening the crx file using Chrome's default file handler causes a "CRX_REQUIRED_
 
 ## Building
 
-For the time being you can run the extension as a local "unpacked" extension, but if you make modifications you may like to make a distributible crx file.
+For the time being you can run the extension as a local "unpacked" extension, but if you make modifications you may like to make a distributible crx file. You can do this with the included build script - just run `make all` in the root directory.
diff --git a/build.sh b/build.sh
new file mode 100644
index 0000000..044c712
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,124 @@
+# Purpose: Pack a Chromium extension directory into crx3 format
+#
+# Sources:
+# https://stackoverflow.com/a/18709204
+# https://cs.chromium.org/chromium/src/components/crx_file/crx3.proto?l=1&rcl=09de3b4e1e13cf10e431ba119b179169cde289fe
+#
+# Modified by Andrew Lorimer, August 2019
+#
+
+description="\e[34m$(basename "$0")\e[0m
+Pack a Chromium extension into CRX3 format
+
+"
+usageshort="\e[1mUSAGE:\e[0m
+  $(basename "$0") [-s src_dir] [-p private_key] [-d output.crx]\n"
+usage="
+\e[1mOPTIONS:\e[0m
+  -s, --source
+    Directory containing all source files to be included in extension.
+    Default: ./src
+
+  -d, --destination
+    Name of a file where generated crx file will be placed. Extisting files will be overwritten.
+    Default: ./build/extension.crx
+
+  -p, --private
+    Location of the private key file.
+    Default: ./extension.pem
+
+  -n, --name
+    Use this as the file name instead of \"extension\" in the above file paths.
+
+  -h, --help
+    Show this help message\n"
+
+dir="$(pwd -P)/src"
+name=$(basename $(pwd -P))
+key=$(pwd -P)/$name.pem
+
+while [ $# -gt 0 ]; do
+  case "$1" in
+    -h|--help)
+      printf "$description$usageshort$usage" 
+      exit
+      ;;
+    -s|--source)
+      dir=(${2-})
+      echo "Using source directory $dir"
+      shift
+      ;;
+    -d|--destination)
+      out=(${2-})
+      echo "Generating crx output at $out"
+      shift
+      ;;
+    -p|--private)
+      key=(${2-})
+      shift
+      ;;
+    -n|--name)
+      name=(${2-})
+      shift
+      ;;
+    --)
+      break
+      ;;
+    *)
+      printf "\x1b[31mInvalid argument $1\x1b[0m\n\n"
+      printf "$usageshort"
+      exit 1
+      ;;
+  esac
+  shift
+done
+
+if [ -z $out ]; then out="$name.crx"; fi
+pub="$name.pub"
+sig="$name.sig"
+zip="$name.zip"
+tosign="$name.presig"
+binary_crx_id="$name.crxid"
+trap 'rm -f "$pub" "$sig" "$zip" "$tosign" "$binary_crx_id"' EXIT
+
+printf "Building $(realpath --relative-to=`pwd` $dir) to $(realpath --relative-to=`pwd` $out) with private key $(realpath --relative-to=`pwd` $key)\n"
+
+# Zip crx directory
+printf "\tZipping source directory\n"
+cwd=$(pwd -P)
+(cd "$dir" && zip -qr -9 -X "$cwd/$zip" .)
+
+
+# Extract crx id
+printf "\tExtracting crx id\n"
+{
+  openssl rsa -in "$key" -pubout -outform der | openssl dgst -sha256 -binary -out "$binary_crx_id"
+} &> /dev/null
+truncate -s 16 "$binary_crx_id"
+
+# Generate file to sign
+printf "\tSigning crx file\n"
+(
+  printf "CRX3 SignedData"
+  echo "00 12 00 00 00 0A 10" | xxd -r -p
+  cat "$binary_crx_id" "$zip"
+) > "$tosign"
+
+openssl dgst -sha256 -binary -sign "$key" < "$tosign" > "$sig" # Signature
+openssl rsa -pubout -outform DER < "$key" > "$pub" 2>/dev/null # Public key
+
+crmagic_hex="43 72 32 34" # Cr24
+version_hex="03 00 00 00" # 3
+header_length="45 02 00 00"
+header_chunk_1="12 AC 04 0A A6 02"
+header_chunk_2="12 80 02"
+header_chunk_3="82 F1 04 12 0A 10"
+(
+  echo "$crmagic_hex $version_hex $header_length $header_chunk_1" | xxd -r -p
+  cat "$pub"
+  echo "$header_chunk_2" | xxd -r -p
+  cat "$sig"
+  echo "$header_chunk_3" | xxd -r -p
+  cat "$binary_crx_id" "$zip"
+) > "$out"
+printf "\tWrote $out\n"
diff --git a/build/newtab.zip b/build/newtab.zip
new file mode 100644
index 0000000..c75da39
Binary files /dev/null and b/build/newtab.zip differ