3 files changed, 123 insertions, 0 deletions
diff --git a/auth/token/add.go b/auth/token/add.go
new file mode 100644
index 0000000..c7f632c
--- /dev/null
+++ b/auth/token/add.go
@@ -0,0 +1,58 @@
+package token
+
+import (
+	"log"
+	"time"
+
+	"tildegit.org/andinus/perseus/storage/sqlite3"
+	"tildegit.org/andinus/perseus/user"
+)
+
+// AddToken will generate a random token, add it to database and
+// return the token.
+func AddToken(db *sqlite3.DB, uInfo map[string]string) (token string, err error) {
+	// Acquire write lock on the database.
+	db.Mu.Lock()
+	defer db.Mu.Unlock()
+
+	token = genToken(64)
+
+	u := user.User{}
+	u.SetUsername(uInfo["username"])
+
+	// Set user id from username.
+	err = u.GetID(db)
+	if err != nil {
+		log.Printf("auth/token.go: %s\n",
+			"failed to get id from username")
+		return
+	}
+
+	// Start the transaction
+	tx, err := db.Conn.Begin()
+	if err != nil {
+		log.Printf("auth/token.go: %s\n",
+			"failed to begin transaction")
+		return
+	}
+
+	stmt, err := db.Conn.Prepare(`
+INSERT INTO access(id, username, genTime) values(?, ?, ?)`)
+	if err != nil {
+		log.Printf("auth/tokenr.go: %s\n",
+			"failed to prepare statement")
+		return
+	}
+	defer stmt.Close()
+
+	_, err = stmt.Exec(u.ID(), u.Username(), time.Now().UTC())
+	if err != nil {
+		log.Printf("auth/token.go: %s\n",
+			"failed to execute statement")
+		return
+	}
+
+	tx.Commit()
+	return
+
+}
diff --git a/auth/token/generate.go b/auth/token/generate.go
new file mode 100644
index 0000000..0c717d9
--- /dev/null
+++ b/auth/token/generate.go
@@ -0,0 +1,14 @@
+package token
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+)
+
+// genToken generates a random token string of length n. Don't forget to
+// seed the random number generator otherwise it won't be random.
+func genToken(n int) string {
+	b := make([]byte, n/2)
+	rand.Read(b)
+	return base64.StdEncoding.EncodeToString(b)
+}
diff --git a/auth/token/validate.go b/auth/token/validate.go
new file mode 100644
index 0000000..f1ee149
--- /dev/null
+++ b/auth/token/validate.go
@@ -0,0 +1,51 @@
+package token
+
+import (
+	"errors"
+	"log"
+
+	"tildegit.org/andinus/perseus/storage/sqlite3"
+	"tildegit.org/andinus/perseus/user"
+)
+
+// ValToken will validate the token and returns an error. If error
+// doesn't equal nil then consider token invalid.
+func ValToken(db *sqlite3.DB, uInfo map[string]string) error {
+	// Acquire read lock on the database.
+	db.Mu.RLock()
+	defer db.Mu.RUnlock()
+
+	u := user.User{}
+	u.SetUsername(uInfo["username"])
+
+	// Set user id from username.
+	err := u.GetID(db)
+	if err != nil {
+		log.Printf("auth/token.go: %s\n",
+			"failed to get id from username")
+		return err
+	}
+
+	// Check if user's token is valid.
+	stmt, err := db.Conn.Prepare("SELECT token FROM access WHERE id = ?")
+	if err != nil {
+		log.Printf("auth/token.go: %s\n",
+			"failed to prepare statement")
+		return err
+	}
+	defer stmt.Close()
+
+	var token string
+	err = stmt.QueryRow(u.ID()).Scan(&token)
+	if err != nil {
+		log.Printf("auth/token.go: %s\n",
+			"query failed")
+		return err
+	}
+
+	if token != uInfo["token"] {
+		err = errors.New("token mismatch")
+	}
+
+	return err
+}