added base tool structure

1 files changed, 20 insertions, 0 deletions

diff --git a/src/tools/jwt-parser/jwt-parser.service.ts b/src/tools/jwt-parser/jwt-parser.service.ts
new file mode 100644
index 0000000..120a099
--- /dev/null
+++ b/src/tools/jwt-parser/jwt-parser.service.ts
@@ -0,0 +1,20 @@
+import jwt_decode, { InvalidTokenError } from 'jwt-decode';
+
+interface JWT {
+  header: Map<string, unknown>;
+  payload: Map<string, unknown>;
+}
+
+export function safe_jwt_decode(raw_jwt: string): JWT {
+  try {
+    const header = jwt_decode(raw_jwt, { header: true }) as Map<string, unknown>;
+    const payload = jwt_decode(raw_jwt) as Map<string, unknown>;
+    return { header: header, payload: payload };
+  } catch (e) {
+    if (e instanceof InvalidTokenError) {
+      return { header: new Map<string, unknown>(), payload: new Map<string, unknown>() };
+    } else {
+      throw e;
+    }
+  }
+}