# Buggy code
def main():
    module = AnsibleModule(
        argument_spec=dict(
            path=dict(required=True, aliases=["dest", "destfile", "name"], type="path"),
            state=dict(default="present", choices=["absent", "present"]),
            marker=dict(default="# {mark} ANSIBLE MANAGED BLOCK", type="str"),
            block=dict(default="", type="str", aliases=["content"]),
            insertafter=dict(default=None),
            insertbefore=dict(default=None),
            create=dict(default=False, type="bool"),
            backup=dict(default=False, type="bool"),
            validate=dict(default=None, type="str"),
        ),
        mutually_exclusive=[["insertbefore", "insertafter"]],
        add_file_common_args=True,
        supports_check_mode=True,
    )

    params = module.params
    path = params["path"]
    if module.boolean(params.get("follow", None)):
        path = os.path.realpath(path)

    if os.path.isdir(path):
        module.fail_json(rc=256, msg="Path %s is a directory !" % path)

    path_exists = os.path.exists(path)
    if not path_exists:
        if not module.boolean(params["create"]):
            module.fail_json(rc=257, msg="Path %s does not exist !" % path)
        original = None
        lines = []
    else:
        f = open(path, "rb")
        original = f.read()
        f.close()
        lines = original.splitlines()

    insertbefore = params["insertbefore"]
    insertafter = params["insertafter"]
    block = to_bytes(params["block"])
    marker = to_bytes(params["marker"])
    present = params["state"] == "present"

    if not present and not path_exists:
        module.exit_json(changed=False, msg="File %s not present" % path)

    if insertbefore is None and insertafter is None:
        insertafter = "EOF"

    if insertafter not in (None, "EOF"):
        insertre = re.compile(insertafter)
    elif insertbefore not in (None, "BOF"):
        insertre = re.compile(insertbefore)
    else:
        insertre = None

    marker0 = re.sub(b(r"{mark}"), b("BEGIN"), marker)
    marker1 = re.sub(b(r"{mark}"), b("END"), marker)
    if present and block:
        # Escape seqeuences like '\n' need to be handled in Ansible 1.x
        if module.ansible_version.startswith("1."):
            block = re.sub("", block, "")
        blocklines = [marker0] + block.splitlines() + [marker1]
    else:
        blocklines = []

    n0 = n1 = None
    for i, line in enumerate(lines):
        if line == marker0:
            n0 = i
        if line == marker1:
            n1 = i

    if None in (n0, n1):
        n0 = None
        if insertre is not None:
            for i, line in enumerate(lines):
                if insertre.search(line):
                    n0 = i
            if n0 is None:
                n0 = len(lines)
            elif insertafter is not None:
                n0 += 1
        elif insertbefore is not None:
            n0 = 0  # insertbefore=BOF
        else:
            n0 = len(lines)  # insertafter=EOF
    elif n0 < n1:
        lines[n0 : n1 + 1] = []
    else:
        lines[n1 : n0 + 1] = []
        n0 = n1

    lines[n0:n0] = blocklines

    if lines:
        result = b("\n").join(lines)
        if original is None or original.endswith(b("\n")):
            result += b("\n")
    else:
        result = ""
    if original == result:
        msg = ""
        changed = False
    elif original is None:
        msg = "File created"
        changed = True
    elif not blocklines:
        msg = "Block removed"
        changed = True
    else:
        msg = "Block inserted"
        changed = True

    if changed and not module.check_mode:
        if module.boolean(params["backup"]) and path_exists:
            module.backup_local(path)
        write_changes(module, result, path)

    if module.check_mode and not path_exists:
        module.exit_json(changed=changed, msg=msg)

    msg, changed = check_file_attrs(module, changed, msg)
    module.exit_json(changed=changed, msg=msg)


# Traceback (nTypeError)
fatal: [******-wi1*********.local]: FAILED! => {"changed": false, "failed": true, "module_stderr":
"Shared connection to ******-wi1.**********.local closed.\r\n", "module_stdout":
"Traceback (most recent call last):\r\n  File \"/tmp/ansible_0s3yacif/ansible_module_blockinfile.py\",
line 334, in <module>\r\n main()\r\n  File \"/tmp/ansible_0s3yacif/ansible_module_blockinfile.py\",
line 284, in main\r\n    if insertre.search(line):\r\nTypeError: cannot use a string
pattern on a bytes-like object\r\n", "msg":
"MODULE FAILURE", "rc": 0}

# Fixed code
def main():
    module = AnsibleModule(
        argument_spec=dict(
            path=dict(required=True, aliases=["dest", "destfile", "name"], type="path"),
            state=dict(default="present", choices=["absent", "present"]),
            marker=dict(default="# {mark} ANSIBLE MANAGED BLOCK", type="str"),
            block=dict(default="", type="str", aliases=["content"]),
            insertafter=dict(default=None),
            insertbefore=dict(default=None),
            create=dict(default=False, type="bool"),
            backup=dict(default=False, type="bool"),
            validate=dict(default=None, type="str"),
        ),
        mutually_exclusive=[["insertbefore", "insertafter"]],
        add_file_common_args=True,
        supports_check_mode=True,
    )

    params = module.params
    path = params["path"]
    if module.boolean(params.get("follow", None)):
        path = os.path.realpath(path)

    if os.path.isdir(path):
        module.fail_json(rc=256, msg="Path %s is a directory !" % path)

    path_exists = os.path.exists(path)
    if not path_exists:
        if not module.boolean(params["create"]):
            module.fail_json(rc=257, msg="Path %s does not exist !" % path)
        original = None
        lines = []
    else:
        f = open(path, "rb")
        original = f.read()
        f.close()
        lines = original.splitlines()

    insertbefore = params["insertbefore"]
    insertafter = params["insertafter"]
    block = to_bytes(params["block"])
    marker = to_bytes(params["marker"])
    present = params["state"] == "present"

    if not present and not path_exists:
        module.exit_json(changed=False, msg="File %s not present" % path)

    if insertbefore is None and insertafter is None:
        insertafter = "EOF"

    if insertafter not in (None, "EOF"):
        insertre = re.compile(to_bytes(insertafter, errors="surrogate_or_strict"))
    elif insertbefore not in (None, "BOF"):
        insertre = re.compile(to_bytes(insertbefore, errors="surrogate_or_strict"))
    else:
        insertre = None

    marker0 = re.sub(b(r"{mark}"), b("BEGIN"), marker)
    marker1 = re.sub(b(r"{mark}"), b("END"), marker)
    if present and block:
        # Escape seqeuences like '\n' need to be handled in Ansible 1.x
        if module.ansible_version.startswith("1."):
            block = re.sub("", block, "")
        blocklines = [marker0] + block.splitlines() + [marker1]
    else:
        blocklines = []

    n0 = n1 = None
    for i, line in enumerate(lines):
        if line == marker0:
            n0 = i
        if line == marker1:
            n1 = i

    if None in (n0, n1):
        n0 = None
        if insertre is not None:
            for i, line in enumerate(lines):
                if insertre.search(line):
                    n0 = i
            if n0 is None:
                n0 = len(lines)
            elif insertafter is not None:
                n0 += 1
        elif insertbefore is not None:
            n0 = 0  # insertbefore=BOF
        else:
            n0 = len(lines)  # insertafter=EOF
    elif n0 < n1:
        lines[n0 : n1 + 1] = []
    else:
        lines[n1 : n0 + 1] = []
        n0 = n1

    lines[n0:n0] = blocklines

    if lines:
        result = b("\n").join(lines)
        if original is None or original.endswith(b("\n")):
            result += b("\n")
    else:
        result = ""
    if original == result:
        msg = ""
        changed = False
    elif original is None:
        msg = "File created"
        changed = True
    elif not blocklines:
        msg = "Block removed"
        changed = True
    else:
        msg = "Block inserted"
        changed = True

    if changed and not module.check_mode:
        if module.boolean(params["backup"]) and path_exists:
            module.backup_local(path)
        write_changes(module, result, path)

    if module.check_mode and not path_exists:
        module.exit_json(changed=changed, msg=msg)

    msg, changed = check_file_attrs(module, changed, msg)
    module.exit_json(changed=changed, msg=msg)