有没有办法使用 python formencode 验证文件大小？

发布于 2025-01-05 17:25:29 字数 232 浏览 3 评论 0原文

我想使用 formencode 在我的 Pyramid 应用程序中验证上传文件的大小。据我了解，我需要创建一个从 formencode.validators.FormValidator) 继承的类并将其放入 chained_validators 中。但我无法找到在 validate_python 方法中检查上传文件大小的方法。有可能吗？

预先感谢，伊万。

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胡渣熟男 2025-01-12 17:25:29

您可以在文件对象本身上使用 len() （在验证器中）来检查文件大小，因为它计算字节数。

size = len(fileObj)

You can use len() (in the validator) on the file object itself to check the file size, since its counting the bytes.

size = len(fileObj)

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成熟稳重的好男人 2025-01-12 17:25:29

当然有 - 虽然我用涡轮齿轮做到了这一点，但它也应该适用于金字塔：

class MyFileValidator(FancyValidator):
    def _to_python(self, value, state):
        max_size = 10*1024*1024

        payload = value.file.read(max_size+1)

        # rewind so that the application can access the content
        value.file.seek(0)

        if len(payload) == max_size:
            raise Invalid(u"The file is too big (>10MB)", value, state)

        return value


class MySchema(Schema):
    my_file = MyFileValidator(not_empty=True)

请注意，不需要读取整个数据（请参阅其他答案） - 我这样做是为了进一步的内容验证。

Sure there is - although I did that with turbogears, it should work with pyramid as well:

class MyFileValidator(FancyValidator):
    def _to_python(self, value, state):
        max_size = 10*1024*1024

        payload = value.file.read(max_size+1)

        # rewind so that the application can access the content
        value.file.seek(0)

        if len(payload) == max_size:
            raise Invalid(u"The file is too big (>10MB)", value, state)

        return value


class MySchema(Schema):
    my_file = MyFileValidator(not_empty=True)

Note that read() ing the whole data should not be necessary (see other answer) - I did that for further content validation.

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尬尬 2025-01-12 17:25:29

另一种方法：

class CheckFileSize(formencode.validators.FormValidator):
    __unpackargs__ = ('upload_field', 'max_file_size')

    def validate_python(self, value_dict, state):
        log.info('test')
        if value_dict.get(self.upload_field) is None:
            return value_dict
        fileobj = getattr(value_dict.get(self.upload_field), 'file', None)
        fileobj.seek(0, os.SEEK_END)
        if int(fileobj.tell()) > int(self.max_file_size):
            raise formencode.Invalid(
                _('File too big'),
                value_dict, state,
                error_dict={self.upload_field:
                    formencode.Invalid(_('File too big'), value_dict, state)})
        return value_dict

class CreateNewCaseForm(formencode.Schema):
    ...
    chained_validators = [
        CheckFileSize('file', max_upload_size),
    ]

Another way to do it:

class CheckFileSize(formencode.validators.FormValidator):
    __unpackargs__ = ('upload_field', 'max_file_size')

    def validate_python(self, value_dict, state):
        log.info('test')
        if value_dict.get(self.upload_field) is None:
            return value_dict
        fileobj = getattr(value_dict.get(self.upload_field), 'file', None)
        fileobj.seek(0, os.SEEK_END)
        if int(fileobj.tell()) > int(self.max_file_size):
            raise formencode.Invalid(
                _('File too big'),
                value_dict, state,
                error_dict={self.upload_field:
                    formencode.Invalid(_('File too big'), value_dict, state)})
        return value_dict

class CreateNewCaseForm(formencode.Schema):
    ...
    chained_validators = [
        CheckFileSize('file', max_upload_size),
    ]

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