feat: add renew endpoint

app/routes/account/renew_password.py

@@ -0,0 +1,73 @@
+import pexpect
+
+import ocflib.account.validators as validators
+
+from fastapi import HTTPException, status
+from pydantic import BaseModel, Field
+
+from routes import router
+
+
+class RenewPasswordInput(BaseModel):
+    username: str = Field(
+        min_length=3,
+        max_length=16,
+    )
+    old_password: str = Field(
+        min_length=5,
+        max_length=256,
+    )
+    new_password: str = Field(
+        min_length=12,
+        max_length=256,
+    )
+
+
+class RenewPasswordOutput(BaseModel):
+    output: str
+
+
+@router.post(
+    "/account/renew-password", tags=["account"], response_model=RenewPasswordOutput
+)
+def renew_password(data: RenewPasswordInput):
+    try:
+        validators.validate_username(data.username)
+        validators.validate_password(
+            data.username, data.old_password, strength_check=False
+        )
+        validators.validate_password(
+            data.username, data.new_password, strength_check=True
+        )
+    except ValueError as ex:
+        raise HTTPException(status.HTTP_400_BAD_REQUEST, detail=str(ex))
+    cmd = "kinit --no-forwardable -l0 {}@OCF.BERKELEY.EDU".format(data.username)
+    child = pexpect.spawn(cmd, timeout=10)
+    child.expect("{}@OCF.BERKELEY.EDU's Password:".format(data.username))
+    child.sendline(data.old_password)
+    try:
+        result = child.expect(["incorrect", "unknown", pexpect.EOF, "expired"])
+        if result == 0:
+            raise HTTPException(
+                status_code=status.HTTP_401_UNAUTHORIZED, detail="Authentication failed"
+            )
+        elif result == 1:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST, detail="Unknown user"
+            )
+        elif result == 2:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST, detail="Password not expired"
+            )
+        else:
+            child.sendline(data.new_password)
+            child.expect("\r\nRepeat new password:")
+            child.sendline(data.new_password)
+            child.expect("\r\nSuccess: Password changed\r\n")
+            output = "Password successfully updated!"
+    except pexpect.exceptions.TIMEOUT:
+        raise HTTPException(
+            status_code=400, detail="Please double check your credentials"
+        )
+
+    return {"output": output}

requirements-minimal.txt

@@ -2,6 +2,7 @@ celery[redis]==5.2.6
 fastapi==0.75.1
 ocflib
 paramiko==2.7.2
+pexpect==4.8.0
 python-dateutil==2.8.2
 python-dotenv==0.19.2
 python-jose==3.3.0