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The existing business completely uses the front-end Angular.JS single-page application, and all requests are sent through ajax.

Now I want to upload files directly to Youpaiyun on the client side. I tried angular file upload, but the submitted result was

400: not accept, miss signature

The packet capture revealed that the form data for policy and signature were not submitted at all.
This is what I wrote:

    $scope.onFileSelect = function ($files) {
        var file = $files[0]; //這里我只傳單個(gè)文件
        $scope.upload = $upload.upload({
            url: 'http://v0.api.upyun.com/youguess',
            method: 'POST',
            headers: {'Content-Type': 'multipart/form-data'},
            data: {
                signature: 'youguess',
                policy: 'youguess'
            },
            fileFormDataName: 'file',
            file: file,
            formDataAppender: function (formData, key, value) {
                if (angular.isArray(value)) {
                    angular.forEach(value, function(v) {
                        formData.append(key, v);
                    });
                } else {
                    formData.append(key, value);
                }
            }
        }).progress(function (event) {
            console.log(parseInt(100.0 * event.loaded / event.total));
        }).success(function (data, status, headers, config) {
            console.log(data);
        });
    };

I referred to this and this issues of this github project

what should I do?

I also have two questions:

1. I can directly encrypt the signature with md5 and write it. Is there any security issue if this md5 is written directly on the client?
2. Can the policy be generated by base64 encoding in js? Because I think the official demo is generated in php. If it can be generated on the front end, will writing this process on the front end also cause security issues?