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-rw-r--r--lib/web.go96
1 files changed, 96 insertions, 0 deletions
diff --git a/lib/web.go b/lib/web.go
new file mode 100644
index 0000000..ab50fc8
--- /dev/null
+++ b/lib/web.go
@@ -0,0 +1,96 @@
+// Copyright © 2020 rsiddharth <s@ricketyspace.net>
+// SPDX-License-Identifier: ISC
+
+package lib
+
+import (
+ "crypto/rand"
+)
+
+type Profile map[string]string
+
+var webSessionEncryptionKey []byte = make([]byte, 16)
+var webUidCounter int64
+var webUserProfiles map[string]Profile = make(map[string]Profile, 0)
+
+func init() {
+ _, err := rand.Read(webSessionEncryptionKey)
+ if err != nil {
+ panic(err)
+ }
+ webUidCounter = 10000
+}
+
+func WebGenUid() int64 {
+ uid := webUidCounter
+ webUidCounter += 1
+
+ return uid
+}
+
+func WebParseKeyValue(encoded string) map[string]string {
+ m := make(map[string]string, 0)
+
+ kvs := StrSplitAt('&', encoded)
+ for i := 0; i < len(kvs); i++ {
+ kv := StrSplitAt('=', kvs[i])
+ m[stripSpaceChars(kv[0])] = kv[1]
+ }
+ return m
+}
+
+func WebProfileFor(email string) string {
+ e := WebSanitizeEmail(email)
+ if len(e) == 0 {
+ panic("email invalid")
+ }
+
+ if p, ok := webUserProfiles[e]; ok {
+ // Profile already exists.
+ return WebEncodeProfile(p)
+ }
+
+ // Create profile.
+ p := make(Profile, 0)
+ p["email"] = e
+ p["uid"] = NumToStr(WebGenUid())
+ p["role"] = "user"
+ webUserProfiles[e] = p
+
+ return WebEncodeProfile(p)
+}
+
+func WebEncodeProfile(p Profile) string {
+ ep := "email=" + p["email"] // Encoded profile.
+ ep += "&uid=" + p["uid"]
+ ep += "&role=" + p["role"]
+ return ep
+}
+
+func WebDecodeProfile(encoded string) Profile {
+ return WebParseKeyValue(encoded)
+}
+
+func WebEncryptProfile(encoded string) []byte {
+ return AESEncryptECB(StrToBytes(encoded), webSessionEncryptionKey)
+}
+
+func WebDecryptProfile(cipher []byte) string {
+ return BytesToStr(AESDecryptECB(cipher, webSessionEncryptionKey))
+}
+
+func WebSanitizeEmail(email string) string {
+ if len(email) < 1 {
+ return ""
+ }
+ se := "" // sanitized email
+
+ // Strip meta characters
+ for i := 0; i < len(email); i++ {
+ if email[i] == '&' || email[i] == '=' {
+ continue
+ }
+ se += string(email[i])
+ }
+ return se
+}