From 9ca296d963a1803a40e3b4761c85fb59673e96f1 Mon Sep 17 00:00:00 2001
From: Sebastian Reichel <sre@ring0.de>
Date: Tue, 5 Feb 2013 23:35:08 +0100
Subject: initial code for GPG support

---
 Makefile       |  4 +--
 src/admin.vala | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/main.vala  | 11 +++++++++
 3 files changed, 91 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index e44a21e..0102716 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 SRC=src/main.vala src/device.vala src/scannersession.vala  src/db.vala src/audio.vala src/web.vala src/graph-data.vala src/template.vala src/websession.vala src/admin.vala src/price.vapi
-DEPS=--pkg posix --pkg linux --pkg libsoup-2.4 --pkg sqlite3 --pkg gee-1.0 --pkg gio-2.0 --pkg gstreamer-0.10
-FLAGS=-X -w --enable-experimental --thread
+DEPS=--pkg posix --pkg linux --pkg libsoup-2.4 --pkg sqlite3 --pkg gee-1.0 --pkg gio-2.0 --pkg gstreamer-0.10 --pkg libarchive --pkg gpgme
+FLAGS=-X -lgpgme -X -w --enable-experimental --thread --vapidir=vapi
 
 barcode-scanner: $(SRC)
 	valac-0.16 --output $@ $(FLAGS) $(DEPS) $^
diff --git a/src/admin.vala b/src/admin.vala
index 4e32a0a..6ba0c0a 100644
--- a/src/admin.vala
+++ b/src/admin.vala
@@ -73,3 +73,81 @@ public class CSVMemberFile {
 		return members;
 	}
 }
+
+public class PGPKeyArchive {
+	private string keyring;
+	private GPG.Context gpg;
+
+	public PGPKeyArchive(KeyFile config) {
+		/* check version (important!) */
+		GPG.check_version();
+
+		/* initialize default context */
+		GPG.Context.Context(out gpg);
+
+		try {
+			keyring = config.get_string("PGP", "keyring");
+
+			/* remove quotes */
+			if(keyring.has_prefix("\"") && keyring.has_suffix("\""))
+				keyring = keyring.substring(1,keyring.length-2);
+		} catch(KeyFileError e) {
+			write_to_log("KeyFileError: %s", e.message);
+			return;
+		}
+
+		/* TODO: check existence of keyring */
+
+		/* set home directory */
+		var info = gpg.get_engine_info();
+		gpg.set_engine_info(info.protocol, info.file_name, keyring);
+	}
+
+	public void read() {
+		unowned Archive.Entry entry;
+		var archive = new Archive.Read();
+
+		/* support all formats & compression types */
+		archive.support_compression_all();
+		archive.support_format_all();
+
+		/* load test archive for now */
+		/* TODO: use archive.open_memory(void *buffer, size_t size) */
+		if(archive.open_filename("pgp-test.tar.gz", 4096) != Archive.Result.OK)
+			return;
+
+		while(archive.next_header(out entry) == Archive.Result.OK) {
+			var name = entry.pathname();
+			var size = entry.size();
+			var content = new uint8[size];
+
+			/* skip entries, which contain a slash */
+			if(name.contains("/"))
+				continue;
+
+			/* skip files, which are big (probably not a minimal pgp key) */
+			if(size > 50000)
+				continue;
+
+			if(archive.read_data((void*) content, (ssize_t) size) == size) {
+				if(!((string) content).has_prefix("-----BEGIN PGP PUBLIC KEY BLOCK-----"))
+					continue;
+
+				/* put byte data into GPG.Data object */
+				GPG.Data gpgdata;
+				GPG.Data.create_from_memory(out gpgdata, content, false);
+
+				/* import keys */
+				gpg.op_import(gpgdata);
+			}
+		}
+	}
+
+	/* TODO: implement method, which list all keys available in the gpg keyring */
+
+	/* TODO: implement method, which gets a key by keyid from gpg keyring */
+
+	/* TODO: implement method, which signs a message */
+
+	/* TODO: implement method, which signs & encrypts a message */
+}
diff --git a/src/main.vala b/src/main.vala
index 7f9d3c1..81f006d 100644
--- a/src/main.vala
+++ b/src/main.vala
@@ -19,6 +19,8 @@ public AudioPlayer audio;
 public CSVMemberFile csvimport;
 public ScannerSession localsession;
 public MainLoop loop;
+public PGPKeyArchive pgp;
+public KeyFile cfg;
 
 const OptionEntry[] option_entries = {
 	{ "version", 'v', OptionFlags.IN_MAIN, OptionArg.NONE, ref opt_version, "output version information and exit", null },
@@ -64,6 +66,15 @@ public static int main(string[] args) {
 	loop  = new MainLoop();
 	localsession = new ScannerSession();
 
+	try {
+		cfg = new KeyFile();
+		cfg.load_from_file("ktt-shopsystem.cfg", KeyFileFlags.NONE);
+	} catch(Error e) {
+		error("Could not load configuration file: %s", e.message);
+	}
+
+	pgp = new PGPKeyArchive(cfg);
+
 	dev.received_barcode.connect((data) => {
 		if(localsession.interpret(data))
 			dev.blink(10);
-- 
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