Add auth and user package

3 files changed, 108 insertions, 0 deletions

diff --git a/auth/genid.go b/auth/genid.go
new file mode 100644
index 0000000..fea7ac9
--- /dev/null
+++ b/auth/genid.go
@@ -0,0 +1,14 @@
+package auth
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+)
+
+// genID generates a random id string of length n. Don't forget to
+// seed the random number generator otherwise it won't be random.
+func genID(n int) string {
+	b := make([]byte, n/2)
+	rand.Read(b)
+	return base64.StdEncoding.EncodeToString(b)
+}
diff --git a/auth/hashpass.go b/auth/hashpass.go
new file mode 100644
index 0000000..4e5041a
--- /dev/null
+++ b/auth/hashpass.go
@@ -0,0 +1,13 @@
+package auth
+
+import (
+	"golang.org/x/crypto/bcrypt"
+)
+
+// hashPass takes a string as input and returns the hash of the
+// password.
+func hashPass(password string) (string, error) {
+	// 10 is the default cost.
+	bytes, err := bcrypt.GenerateFromPassword([]byte(password), 10)
+	return string(bytes), err
+}
diff --git a/auth/register.go b/auth/register.go
new file mode 100644
index 0000000..c50f3f4
--- /dev/null
+++ b/auth/register.go
@@ -0,0 +1,81 @@
+package auth
+
+import (
+	"log"
+	"strings"
+	"time"
+
+	"tildegit.org/andinus/perseus/storage/sqlite3"
+	"tildegit.org/andinus/perseus/user"
+)
+
+// Register takes in registration details and returns an error. If
+// error doesn't equal nil then the registration was unsucessful.
+// regInfo should have username, password & ip.
+func Register(db *sqlite3.DB, regInfo map[string]string) error {
+	u := user.User{}
+	u.SetID(genID(64))
+	u.SetUsername(strings.ToLower(regInfo["username"]))
+
+	pass, err := hashPass(regInfo["password"])
+	if err != nil {
+		log.Printf("auth/register.go: %s\n",
+			"hashPass func failed")
+		return err
+	}
+	u.SetPassword(pass)
+
+	// Acquire write lock on the database.
+	db.Mu.Lock()
+	defer db.Mu.Unlock()
+
+	err = insertRecords(db, u, regInfo)
+	return err
+}
+
+func insertRecords(db *sqlite3.DB, u user.User, regInfo map[string]string) error {
+	// Start the transaction
+	tx, err := db.Conn.Begin()
+	if err != nil {
+		log.Printf("auth/register.go: %s\n",
+			"Failed to begin transaction")
+		return err
+	}
+
+	// Insert the record into registration table
+	regStmt, err := db.Conn.Prepare(`
+INSERT INTO registration(id, username, reg_time, reg_ip) values(?, ?, ?, ?)`)
+	if err != nil {
+		log.Printf("auth/register.go: %s\n",
+			"Failed to prepare statement")
+		return err
+	}
+	defer regStmt.Close()
+
+	_, err = regStmt.Exec(u.ID(), u.Username(), time.Now().UTC(), regInfo["ip"])
+	if err != nil {
+		log.Printf("auth/register.go: %s\n",
+			"Failed to execute statement")
+		return err
+	}
+
+	// Insert the record into users table
+	usrStmt, err := db.Conn.Prepare(`
+INSERT INTO users(id, username, password) values(?, ?, ?)`)
+	if err != nil {
+		log.Printf("auth/register.go: %s\n",
+			"Failed to prepare statement")
+		return err
+	}
+	defer usrStmt.Close()
+
+	_, err = usrStmt.Exec(u.ID(), u.Username(), u.Password())
+	if err != nil {
+		log.Printf("auth/register.go: %s\n",
+			"Failed to execute statement")
+		return err
+	}
+
+	tx.Commit()
+	return err
+}