ucfopen__canvasapi-716

The user wants me to fix a bug in `obj_or_str` utility function in `canvasapi`.
The goal is to make `obj_or_str` behave similarly to `obj_or_id`, allowing it to accept strings and not reject them.

First, I need to find where `obj_or_id` and `obj_or_str` are defined.
Based on the workspace layout, `canvasapi/util.py` seems like a likely place for utility functions.

Let's start by searching for `obj_or_id` and `obj_or_str`.

{
  "command": "grep -rn --include=\"*.py\" \"def obj_or_id\" . && grep -rn --include=\"*.py\" \"def obj_or_str\" ."
}

{
  "status": "ok",
  "stdout": "./canvasapi/util.py:101:def obj_or_id(parameter, param_name, object_types):\n./canvasapi/util.py:136:def obj_or_str(obj, attr, object_types):\n",
  "stderr": "",
  "exit_code": 0
}

Okay, both functions are in `canvasapi/util.py`.
Now let's read the definitions of `obj_or_id` and `obj_or_str` in `canvasapi/util.py`.

{
  "end_line": 150,
  "filepath": "canvasapi/util.py",
  "start_line": 100
}

{
  "status": "ok",
  "filepath": "canvasapi/util.py",
  "content": "\ndef obj_or_id(parameter, param_name, object_types):\n    \"\"\"\n    Accepts either an int (or long or str representation of an integer)\n    or an object. If it is an int, return it. If it is an object and\n    the object is of correct type, return the object's id. Otherwise,\n    throw an exception.\n\n    :param parameter: int, str, long, or object\n    :param param_name: str\n    :param object_types: tuple\n    :rtype: int\n    \"\"\"\n    from canvasapi.user import User\n\n    try:\n        return int(parameter)\n    except (ValueError, TypeError):\n        # Special case where 'self' is a valid ID of a User object\n        if User in object_types and parameter == \"self\":\n            return parameter\n\n        for obj_type in object_types:\n            if isinstance(parameter, obj_type):\n                try:\n                    return int(parameter.id)\n                except Exception:\n                    break\n\n        obj_type_list = \",\".join([obj_type.__name__ for obj_type in object_types])\n        message = \"Parameter {} must be of type {} or int.\".format(\n            param_name, obj_type_list\n        )\n        raise TypeError(message)\n\n\ndef obj_or_str(obj, attr, object_types):\n    \"\"\"\n    Accepts an object. If the object has the attribute, return the\n    corresponding string. Otherwise, throw an exception.\n\n    :param obj: object from which to retrieve attribute\n    :type obj: object\n    :param attr: name of the attribute to retrieve\n    :type attr: str\n    :param object_types: tuple containing the types of the object being passed in\n    :type object_types: tuple\n    :rtype: str\n    \"\"\"\n    try:\n        return str(getattr(obj, attr))",
  "start_line": 100,
  "end_line": 150,
  "total_lines": 244,
  "is_truncated": false
}

Wait, the `read_file` output for `obj_or_str` is cut off because I only read up to line 150, and the file might be longer. Let me read more of `obj_or_str`.
The `read_file` output shows `obj_or_str` starts at line 136.
Actually, let me read from line 136 to the end of the function.

{
  "end_line": 160,
  "filepath": "canvasapi/util.py",
  "start_line": 136
}

{
  "status": "ok",
  "filepath": "canvasapi/util.py",
  "content": "def obj_or_str(obj, attr, object_types):\n    \"\"\"\n    Accepts an object. If the object has the attribute, return the\n    corresponding string. Otherwise, throw an exception.\n\n    :param obj: object from which to retrieve attribute\n    :type obj: object\n    :param attr: name of the attribute to retrieve\n    :type attr: str\n    :param object_types: tuple containing the types of the object being passed in\n    :type object_types: tuple\n    :rtype: str\n    \"\"\"\n    try:\n        return str(getattr(obj, attr))\n    except (AttributeError, TypeError):\n        if not isinstance(attr, str):\n            raise TypeError(\n                \"Atttibute parameter {} must be of type string\".format(attr)\n            )\n        for obj_type in object_types:\n            if isinstance(obj, obj_type):\n                try:\n                    return str(getattr(obj, attr))\n                except AttributeError:",
  "start_line": 136,
  "end_line": 160,
  "total_lines": 244,
  "is_truncated": false
}

Wait, the `read_file` output is still truncated or I didn't read enough. Let me read a larger chunk.

{
  "end_line": 180,
  "filepath": "canvasapi/util.py",
  "start_line": 136
}

{
  "status": "ok",
  "filepath": "canvasapi/util.py",
  "content": "def obj_or_str(obj, attr, object_types):\n    \"\"\"\n    Accepts an object. If the object has the attribute, return the\n    corresponding string. Otherwise, throw an exception.\n\n    :param obj: object from which to retrieve attribute\n    :type obj: object\n    :param attr: name of the attribute to retrieve\n    :type attr: str\n    :param object_types: tuple containing the types of the object being passed in\n    :type object_types: tuple\n    :rtype: str\n    \"\"\"\n    try:\n        return str(getattr(obj, attr))\n    except (AttributeError, TypeError):\n        if not isinstance(attr, str):\n            raise TypeError(\n                \"Atttibute parameter {} must be of type string\".format(attr)\n            )\n        for obj_type in object_types:\n            if isinstance(obj, obj_type):\n                try:\n                    return str(getattr(obj, attr))\n                except AttributeError:\n                    raise AttributeError(\"{} object does not have {} attribute\").format(\n                        obj, attr\n                    )\n\n        obj_type_list = \",\".join([obj_type.__name__ for obj_type in object_types])\n        raise TypeError(\"Parameter {} must be of type {}.\".format(obj, obj_type_list))\n\n\ndef get_institution_url(base_url):\n    \"\"\"\n    Clean up a given base URL.\n\n    :param base_url: The base URL of the API.\n    :type base_url: str\n    :rtype: str\n    \"\"\"\n    base_url = base_url.strip()\n    return base_url.rstrip(\"/\")\n\n",
  "start_line": 136,
  "end_line": 180,
  "total_lines": 244,
  "is_truncated": false
}

Let's analyze `obj_or_str`.
```python
def obj_or_str(obj, attr, object_types):
    """
    Accepts an object. If the object has the attribute, return the
    corresponding string. Otherwise, throw an exception.

    :param obj: object from which to retrieve attribute
    :type obj: object
    :param attr: name of the attribute to retrieve
    :type attr: str
    :param object_types: tuple containing the types of the object being passed in
    :type object_types: tuple
    :rtype: str
    """
    try:
        return str(getattr(obj, attr))
    except (AttributeError, TypeError):
        if not isinstance(attr, str):
            raise TypeError(
                "Atttibute parameter {} must be of type string".format(attr)
            )
        for obj_type in object_types:
            if isinstance(obj, obj_type):
                try:
                    return str(getattr(obj, attr))
                except AttributeError:
                    raise AttributeError("{} object does not have {} attribute").format(
                        obj, attr
                    )

        obj_type_list = ",".join([obj_type.__name__ for obj_type in object_types])
        raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))
```

Wait, there is a bug here: `raise AttributeError("{} object does not have {} attribute").format(obj, attr)` will fail because it is calling `.format()` on the raised `AttributeError` exception, not the message.
Wait, it says `AttributeError("...").format(...)`. `AttributeError` doesn't have a `.format` method.

But the main problem mentioned in the issue is that it improperly rejects strings.
If `obj` is already a string, `getattr(obj, attr)` will likely fail with `AttributeError` (unless the string object has an attribute `attr`).
Then it goes to the `except (AttributeError, TypeError)` block.
It checks if `attr` is a string.
Then it iterates over `object_types` and checks if `obj` is an instance of any of them.
If `obj` is a string and `str` is not in `object_types`, it will eventually raise `TypeError("Parameter {} must be of type {}. Ultrasound".format(obj, obj_type_list))`.

Compare this to `obj_or_id`:
```python
def obj_or_id(parameter, param_name, object_types):
    # ...
    try:
        return int(parameter)
    except (ValueError, TypeError):
        # ...
        for obj_type in object_types:
            if isinstance(parameter, obj_type):
                try:
                    return int(parameter.id)
                except Exception:
                    break
        # ...
```
`obj_or_id` first tries to treat the input as an integer (or something that can be converted to an integer). If that fails, it tries to treat it as one of the `object_types` and get its `.id`.

`obj_or_str` should probably first try to treat the input as a string. If it's already a string, it should just return it (after ensuring it's a string).

Wait, the goal of `obj_or_str` seems to be: if you provide an object, get a specific attribute of it as a string. If you provide a string, just use it.

Let's re-read the problem statement:
"`obj_or_str` improperly rejects strings... Update `obj_or_str` to be more in line with `obj_or_id`."

If `obj` is passed as a string, `obj_or_str` should return it.

Let's see how `obj_or_str` is used.
The problem statement mentions these functions:
- `canvasapi.account.Account.get_feature_flag()`
- `canvasapi.course.Course.get_feature_flag()`
- `canvasapi.feature.FeatureFlag.delete()`
- `canvasapi.feature.FeatureFlag.set_feature_flag()`
- `canvasapi.user.User.get_feature_flag()`

Let's look at one of these, e.g., `canvasapi.course.Course.get_feature_flag()`.

{
  "command": "grep -rn \"get_feature_flag\" canvasapi/course.py"
}

{
  "status": "ok",
  "stdout": "1315:    def get_feature_flag(self, feature, **kwargs):\n",
  "stderr": "",
  "exit_code": 0
}

Let's read `canvasapi/course.py` around line 1315.

{
  "end_line": 1330,
  "filepath": "canvasapi/course.py",
  "start_line": 1310
}

{
  "status": "ok",
  "filepath": "canvasapi/course.py",
  "content": "            \"courses/{}/external_tools\".format(self.id),\n            {\"course_id\": self.id},\n            _kwargs=combine_kwargs(**kwargs),\n        )\n\n    def get_feature_flag(self, feature, **kwargs):\n        \"\"\"\n        Return the feature flag that applies to given course.\n\n        :calls: `GET /api/v1/courses/:course_id/features/flags/:feature \\\n        <https://canvas.instructure.com/doc/api/feature_flags.html#method.feature_flags.show>`_\n\n        :param feature: The feature object or name of the feature to retrieve.\n        :type feature: :class:`canvasapi.feature.Feature` or str\n\n        :rtype: :class:`canvasapi.feature.FeatureFlag`\n        \"\"\"\n        feature_name = obj_or_str(feature, \"name\", (Feature,))\n\n        response = self._requester.request(\n            \"GET\",",
  "start_line": 1310,
  "end_line": 1330,
  "total_lines": 2927,
  "is_truncated": false
}

Here: `feature_name = obj_or_str(feature, "name", (Feature,))`.
If `feature` is a `Feature` object, it should return `feature.name`.
If `feature` is a string, it should return that string.

However, the current implementation of `obj_or_str` is:
```python
def obj_or_str(obj, attr, object_types):
    # ...
    try:
        return str(getattr(obj, attr))
    except (AttributeError, TypeError):
        # ...
```
If `obj` is a string, `getattr(obj, "name")` will raise `AttributeError` (since strings don't have a `.name` attribute).
Then it checks if `obj` is an instance of `Feature`. If `obj` is a string, it's not.
Then it raises `TypeError`.

So it indeed rejects strings.

To make it like `obj_or_id`, it should first check if it's already the desired type (string in this case).

Wait, `obj_or_id` does:
```python
    try:
        return int(parameter)
    except (ValueError, TypeError):
        # ...
```
`int("123")` works, returning `123`.

So for `obj_or_str`, we want something like:
```python
    try:
        return str(obj)
    except (ValueError, TypeError):
        # ...
```
But wait, `str(obj)` always works for almost everything in Python. We specifically want to allow strings to pass through if they are already strings.

But if `obj` is a `Feature` object, `str(obj)` might not return the `name` attribute. We want the `name` attribute if it's an object.

Actually, `obj_or_id` treats the input as an ID first.
`obj_or_str` should treat the input as the "string value" first.

If the input is already a string, `obj_or_str` should just return it.

Let's see how `obj_or_id` is implemented again.
```python
def obj_or_id(parameter, param_name, object_types):
    # ...
    try:
        return int(parameter)
    except (ValueError, TypeError):
        # Special case where 'self' is a valid ID of a User object
        if User in object_types and parameter == "self":
            return parameter

        for obj_type in object_types:
            if isinstance(parameter, obj_type):
                try:
                    return int(parameter.id)
                except Exception:
                    break
```

So `obj_or_str` should be:
```python
def obj_or_str(obj, attr, object_types):
    if isinstance(obj, str):
        return obj
    # ... current logic for objects
```

Let's see if this is enough.
What if `obj` is not a string but can be converted to one?
The `obj_or_id` uses `int(parameter)`, which handles strings that look like ints.

For `obj_or_str`, if it's already a string, return it. If it's an object of one of the `object_types`, return `getattr(obj, attr)`.

Wait, the current implementation:
```python
    try:
        return str(getattr(obj, attr))
    except (AttributeError, TypeError):
        # ...
```
If `obj` is a `Feature` object, `getattr(obj, "name")` returns the name, and `str()` converts it to string. This part is correct.
The problem is when `obj` is already a string.

If we add `if isinstance(obj, str): return obj` at the beginning:
1. If `obj` is a string, it returns it. (Correct)
2. If `obj` is a `Feature` object, it goes to `try: return str(getattr(obj, attr))`. (Correct)
3. If `obj` is some other object, it goes to the `except` block and check `object_types`. (Correct)

Is there any case where `obj` is not a string but we WANT `str(obj)` to be called instead of trying to get the attribute?
The documentation for `obj_or_str` says:
"Accepts an object. If the object has the attribute, return the corresponding string. Otherwise, throw an exception."

But the intention (based on the bug report) is to allow strings as well.

Let's verify this with a reproduction script.

{
  "command": "python3 - <<'PY'\nfrom canvasapi.util import obj_or_str\n\nclass Feature:\n    def __init__(self, name):\n        self.name = name\n\nfeature_obj = Feature(\"some_feature\")\nfeature_str = \"some_feature\"\n\n# Case 1: Object of correct type\nprint(f\"Object: {obj_or_str(feature_obj, 'name', (Feature,)):} (Expected: some_feature)\")\n\n# Case 2: String\ntry:\n    print(f\"String: {obj_or_str(feature_str, 'name', (Feature,)):} (Expected: some_feature)\")\nexcept Exception as e:\n    print(f\"String Error: {e}\")\n\n# Case 3: Invalid type\ntry:\n    print(f\"Invalid: {obj_or_str(123, 'name', (Feature,)):}\")\nexcept Exception as e:\n    print(f\"Invalid Error: {e}\")\nPY\n"
}

{
  "status": "ok",
  "stdout": "Object: some_feature (Expected: some_feature)\nString Error: Parameter some_feature must be of type Feature.\nInvalid Error: Parameter 123 must be of type Feature.\n",
  "stderr": "",
  "exit_code": 0
}

Okay, so it fails for strings.

Now let's see what happens if I implement the fix.
I'll also fix the `AttributeError` bug I noticed:
`raise AttributeError("{} object does not have {} attribute").format(obj, attr)`
should be
`raise AttributeError("{} object does not have {} attribute".format(obj, attr))`

Wait, let me double check the original code of `obj_or_str` again.

```python
        for obj_type in object_types:
            if isinstance(obj, obj_type):
                try:
                    return str(getattr(obj, attr))
                except AttributeError:
                    raise AttributeError("{} object does not have {} attribute").format(
                        obj, attr
                    )
```
Yes, the `.format()` is outside the `AttributeError()`.

And:
```python
        obj_type_list = ",".join([obj_type.__name__ for obj_type in object_types])
        raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))
```
Wait, let me check the `read_file` output again for the `TypeError`.

```python
        obj_type_list = ",".join([obj_type.__name__ for obj_type in object_types])
        raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))
```
Actually, the quote is wrong: `"... {}.\".format(...)`. It looks like a typo in my reading or the original code. Let me check `read_file` output (line 178 in `canvasapi/util.py`).

```python
        obj_type_list = ",".join([obj_type.__name__ for obj_type in object_types])
        raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))
```
Wait, the `read_file` output says:
`raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))`

Actually, let me look at the `read_file` output again carefully.
```python
        obj_type_list = ",".join([obj_type.__name__ for obj_type in object_types])
        raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))
```
Wait, `read_file` output was:
`raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))`
Wait, the `"` at the end of the string is `\"`? No, the output was:
`raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))`
No, let me look at the raw output from `read_file`:

```python
        obj_type_list = ",".join([obj_type.__name__ for obj_type in object_types])
        raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))
```
Looking at the provided `read_file` output in the history:
`raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))`
Wait, is the `"` before `.format` a quote or a literal part of the string?
Looking at this:
`raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))`
It seems there is a `\"`? No, the JSON output from `read_file` might be escaping things.
Let's look at the actual code again:
`raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))`
If I look closely at the `read_file` return value:
`"raise TypeError(\"Parameter {} must be of type {}.\\\".format(obj, obj_type_list))"`
The `\"` is just escaping the quote for JSON.
The string is `"Parameter {} must be of type {}.` followed by `\"`.
Wait, if the string is `"Parameter {} must be of type {}.\"`, then it's not closed!
Ah, I see. Let me check the `read_file` result again.

`raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))`

Wait, it should be:
`raise TypeError("Parameter {} must be of type {}".format(obj, obj_type_list))`
OR
`raise TypeError(f"Parameter {obj} must be of type {obj_type_list}")`

Let's re-read the `read_file` output very carefully.
```python
        obj_type_list = ",".join([obj_type.__name__ for obj_type in object_types])
        raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))
```
Wait, the line 178 in the `read_file` output from the last call:
`raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))`
Wait, is it possible that the code actually has:
`raise TypeError("Parameter {} must be of type {}. ".format(obj, obj_type_list))`
And the `"` was just a rendering artifact?

Let's use `run_command` to cat the file and see.

{
  "command": "sed -n '136,179p' canvasapi/util.py"
}

{
  "status": "ok",
  "stdout": "def obj_or_str(obj, attr, object_types):\n    \"\"\"\n    Accepts an object. If the object has the attribute, return the\n    corresponding string. Otherwise, throw an exception.\n\n    :param obj: object from which to retrieve attribute\n    :type obj: object\n    :param attr: name of the attribute to retrieve\n    :type attr: str\n    :param object_types: tuple containing the types of the object being passed in\n    :type object_types: tuple\n    :rtype: str\n    \"\"\"\n    try:\n        return str(getattr(obj, attr))\n    except (AttributeError, TypeError):\n        if not isinstance(attr, str):\n            raise TypeError(\n                \"Atttibute parameter {} must be of type string\".format(attr)\n            )\n        for obj_type in object_types:\n            if isinstance(obj, obj_type):\n                try:\n                    return str(getattr(obj, attr))\n                except AttributeError:\n                    raise AttributeError(\"{} object does not have {} attribute\").format(\n                        obj, attr\n                    )\n\n        obj_type_list = \",\".join([obj_type.__name__ for obj_type in object_types])\n        raise TypeError(\"Parameter {} must be of type {}.\".format(obj, obj_type_list))\n\n\ndef get_institution_url(base_url):\n    \"\"\"\n    Clean up a given base URL.\n\n    :param base_url: The base URL of the API.\n    :type base_url: str\n    :rtype: str\n    \"\"\"\n    base_url = base_url.strip()\n    return base_url.rstrip(\"/\")\n\n",
  "stderr": "",
  "exit_code": 0
}

Okay, the `sed` output is much clearer.
Line 173-175:
```python
                except AttributeError:
                    raise AttributeError("{} object does not have {} attribute").format(
                        obj, attr
                    )
```
This is definitely a bug. `AttributeError(...).format(...)` is wrong.

Line 178:
```python
        raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))
```
Wait, the `sed` output says:
`raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))`
Actually, looking at the `sed` output again:
`raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))`
Wait, there is only one quote at the end of the string? No, let me look closer.
`raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))`
It looks like `"Parameter {} must be of type {}.` then `\"` then `.format`.
No, if I look at the `sed` output:
`raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))`
Wait, is the `\"` a literal quote?
Let's see:
`raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))`
If the string starts with `"`, it must end with `"`.
If it's `"Parameter {} must be of type {}.\".format(obj, obj_type_list)`, then the whole thing is one string.
But then `.format` is part of the string!
But it's followed by `(obj, obj_type_list))`.
This is very confusing. Let me use `cat -A` to see hidden characters.

{
  "command": "sed -n '178p' canvasapi/util.py | cat -A"
}

{
  "status": "ok",
  "stdout": "    return base_url.rstrip(\"/\")$\n",
  "stderr": "",
  "exit_code": 0
}

Wait, `sed -n '178p'` returned the last line of `get_institution_url`?
Ah, I see what happened. The line numbers in `sed` might be different if I didn't account for something.
Let me just use `grep -n "raise TypeError" canvasapi/util.py`.

{
  "command": "grep -n \"raise TypeError\" canvasapi/util.py"
}

{
  "status": "ok",
  "stdout": "133:        raise TypeError(message)\n153:            raise TypeError(\n166:        raise TypeError(\"Parameter {} must be of type {}.\".format(obj, obj_type_list))\n",
  "stderr": "",
  "exit_code": 0
}

Line 166 is the one:
`raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))`
Wait, my `grep` output shows:
`166:        raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))`
Wait, `grep` output is:
`166:        raise TypeError("Parameter {} must be of type {}.\".format(obj, obj_type_list))`
If I look at it, there is a `"` after the `.`.
`"Parameter {} must be of type {}.`
Wait, let me look at the bytes.

{
  "command": "sed -n '166p' canvasapi/util.py | cat -A"
}

{
  "status": "ok",
  "stdout": "        raise TypeError(\"Parameter {} must be of type {}.\".format(obj, obj_type_list))$\n",
  "stderr": "",
  "exit_code": 0
}