Preliminary stuff -- more work needed

3 files changed, 222 insertions, 0 deletions

diff --git a/parse.go b/parse.go
new file mode 100644
index 0000000..5d9d7f8
--- /dev/null
+++ b/parse.go
@@ -0,0 +1,97 @@
+package main
+
+import (
+	"fmt"
+	"github.com/KatolaZ/git2go"
+	"golang.org/x/crypto/openpgp"
+	"os"
+	"strings"
+	"log"
+)
+
+func CommitToString(commit *git.Commit) string {
+
+	var ret string
+
+	ret += fmt.Sprintf("type: %s\n", commit.Type())
+	ret += fmt.Sprintf("Id: %s\n", commit.Id())
+	ret += fmt.Sprintf("Author: %s\n", commit.Author())
+	ret += fmt.Sprintf("Message: %s\n", commit.Message())
+	ret += fmt.Sprintf("Parent-count: %d\n", commit.ParentCount())
+
+	return ret
+}
+
+// FIXME: RETURN THE ENTITY PROVIDED BY THE CHECK, OR nil
+func check_signature(commit *git.Commit, keyring *openpgp.KeyRing) (signature, signed string, err error) {
+
+	signature, signed, err = commit.ExtractSignature()
+	if err == nil {
+
+		_, err_sig :=
+			openpgp.CheckArmoredDetachedSignature(*keyring, strings.NewReader(signed),
+				strings.NewReader(signature))
+
+		if err_sig == nil {
+			fmt.Printf("Good signature \n")
+			return signature, signed, nil
+		}
+		err = err_sig
+	}
+
+	return "", "", err
+}
+
+func walk_commits(msg SCORSHmsg, keyring openpgp.KeyRing) int {
+
+	fmt.Printf("Inside parse_commits\n")
+
+	reponame := msg.repo
+	old_rev := msg.old_rev
+	new_rev := msg.new_rev
+
+	repo, err := git.OpenRepository(reponame)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error while opening repository %s (%s)\n",
+			reponame, err)
+		return SCORSH_ERR_NO_REPO
+	}
+
+	old_rev_oid, err := git.NewOid(old_rev)
+
+	oldrev_commit, err := repo.LookupCommit(old_rev_oid)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Commit: %s does not exist\n", old_rev)
+		return SCORSH_ERR_NO_COMMIT
+	}
+
+	new_rev_oid, err := git.NewOid(new_rev)
+
+	newrev_commit, err := repo.LookupCommit(new_rev_oid)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Commit: %s does not exist\n", new_rev)
+		return SCORSH_ERR_NO_COMMIT
+	}
+
+	cur_commit := newrev_commit
+
+	for cur_commit.Id().String() != oldrev_commit.Id().String() {
+
+		commit, err := repo.LookupCommit(cur_commit.Id())
+		if err == nil {
+
+			fmt.Printf("%s", CommitToString(commit))
+			//signature, signed, err := check_signature(commit, &keyring)
+			_, _, err := check_signature(commit, &keyring)
+			if err != nil {
+				log.Printf("%s\n", SCORSHErr(SCORSH_ERR_SIGNATURE))
+				
+			}
+			cur_commit = commit.Parent(0)
+		} else {
+			fmt.Printf("Commit %x not found!\n", cur_commit.Id())
+			return SCORSH_ERR_NO_COMMIT
+		}
+	}
+	return 0
+}
diff --git a/scorsh.go b/scorsh.go
new file mode 100644
index 0000000..cf8e5f0
--- /dev/null
+++ b/scorsh.go
@@ -0,0 +1,81 @@
+package main
+
+import (
+	"errors"
+	"golang.org/x/crypto/openpgp"
+	"log"
+	"os"
+)
+
+const (
+	SCORSH_ERR_NO_FILE = -(1 << iota)
+	SCORSH_ERR_KEYRING
+	SCORSH_ERR_NO_REPO
+	SCORSH_ERR_NO_COMMIT
+	SCORSH_ERR_SIGNATURE
+)
+
+type SCORSHmsg struct {
+	repo    string
+	branch  string
+	old_rev string
+	new_rev string
+}
+
+func SCORSHErr(err int) error {
+
+	var err_str string
+
+	switch err {
+	case SCORSH_ERR_NO_FILE:
+		err_str = "Invalid file name"
+	case SCORSH_ERR_KEYRING:
+		err_str = "Invalid keyring"
+	case SCORSH_ERR_NO_REPO:
+		err_str = "Invalid repository"
+	case SCORSH_ERR_NO_COMMIT:
+		err_str = "Invalid commit ID"
+	case SCORSH_ERR_SIGNATURE:
+		err_str = "Invalid signature"
+	default:
+		err_str = "Generic Error"
+	}
+
+	return errors.New(err_str)
+
+}
+
+func SCORSHWorker(keyring string, c_msg chan SCORSHmsg, c_status chan int) {
+
+	// read the worker configuration file
+
+	// Open the keyring file
+	f, err := os.Open(keyring)
+	defer f.Close()
+
+	if err != nil {
+		log.Printf("[worker] cannot open file %s\n", keyring)
+		c_status <- SCORSH_ERR_NO_FILE
+		return
+	}
+
+	// load the keyring
+	kr, err := openpgp.ReadArmoredKeyRing(f)
+
+	if err != nil {
+		log.Printf("[worker] cannot open keyring %s\n", keyring)
+		log.Printf("%s\n", err)
+		c_status <- SCORSH_ERR_KEYRING
+		return
+	}
+
+	// wait for messages from the  c_msg channel
+
+	msg := <-c_msg
+
+	// process message
+	ret := walk_commits(msg, kr)
+
+	c_status <- ret
+
+}
diff --git a/spooler.go b/spooler.go
new file mode 100644
index 0000000..c0bc8a1
--- /dev/null
+++ b/spooler.go
@@ -0,0 +1,44 @@
+package main
+
+import (
+	"github.com/fsnotify/fsnotify"
+	"log"
+	"os"
+)
+
+// parse a request file and return a SCORSHmessage
+func parse_request(fname string) (SCORSHmsg, error) {
+
+	var ret SCORSHmsg
+	_, err := os.Open(fname)
+	if err != nil {
+		log.Printf("Unable to open file: %s\n", fname)
+		return ret, SCORSHErr(SCORSH_ERR_NO_FILE)
+	}
+	
+	return ret, nil
+	
+}
+
+func spooler(watcher *fsnotify.Watcher, worker chan SCORSHmsg) {
+
+	for {
+		select {
+		case event := <-watcher.Events:
+			if event.Op == fsnotify.Create {
+				msg, err := parse_request(event.Name)
+				if err != nil {
+					log.Printf("Invalid packet received. [%s]\n", err)
+				}
+				worker <- msg
+			}
+		case err := <-watcher.Errors:
+			log.Println("error:", err)
+		}
+	}
+}
+
+
+func main(){
+
+}