Docker Hub API v2令牌认证问题

Question

目前，我正在开发一个非常轻量级的Docker容器编排器，而且我必须能够从公共Docker Hub注册表中获取映像摘要。我想为此使用Docker Registry API v2。

我正在尝试使用以下API调用获取授权令牌：

curl https://auth.docker.io/token?service=index.docker.io&scope=repository:alpine:pull

...，我得到如下响应：

{"token":"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.eyJhY2Nlc3MiOltdLCJhdWQiOiJpbmRleC5kb2NrZXIuaW8iLCJleHAiOjE0NzQ1NDcyODMsImlhdCI6MTQ3NDU0Njk4MywiaXNzIjoiYXV0aC5kb2NrZXIuaW8iLCJqdGkiOiIzVTdCazF4dm9CLVA0MGJWVF9JSiIsIm5iZiI6MTQ3NDU0Njk4Mywic3ViIjoiIn0.516fS692WGHNi5Sc44iB8OFSLairrM6n1zNvVo5KXAxlsxsP4rE7VDmW5d0YqvTYeKfZAYIi9yEptx4xJlQ6DA"}

似乎一切正常，我正在尝试将获得的令牌用于下一个API调用：

curl -i -H "Authorization: Bearer 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.eyJhY2Nlc3MiOltdLCJhdWQiOiJpbmRleC5kb2NrZXIuaW8iLCJleHAiOjE0NzQ1NDcyODMsImlhdCI6MTQ3NDU0Njk4MywiaXNzIjoiYXV0aC5kb2NrZXIuaW8iLCJqdGkiOiIzVTdCazF4dm9CLVA0MGJWVF9JSiIsIm5iZiI6MTQ3NDU0Njk4Mywic3ViIjoiIn0.516fS692WGHNi5Sc44iB8OFSLairrM6n1zNvVo5KXAxlsxsP4rE7VDmW5d0YqvTYeKfZAYIi9yEptx4xJlQ6DA" https://index.docker.io/v2/alpine/manifests/latest

...而我得到的是：

HTTP/1.1 401 Unauthorized
Content-Type: application/json; charset=utf-8
Docker-Distribution-Api-Version: registry/2.0
Www-Authenticate: Bearer realm="https://auth.docker.io/token",service="registry.docker.io",scope="repository:alpine:pull",error="invalid_token"
Date: Thu, 22 Sep 2016 12:27:54 GMT
Content-Length: 138
Strict-Transport-Security: max-age=31536000

{"errors":[{"code":"UNAUTHORIZED","message":"authentication required","detail":[{"Type":"repository","Name":"alpine","Action":"pull"}]}]}

有人知道为什么令牌般的迷惑对于如此简单的流程会失败吗？

Answer 1

Www-Authenticate标头中的响应试图告诉您您需要什么，尽管它可能会更有用。

第一件事：service您想要的是registry.docker.io。

第二件事：中的存储库名称scope不完整。官方存储库只有一个类似alpineCLI 的单部分名称，但是在注册表中正确地称为library/alpine。

因此，您的令牌请求应为：

curl "https://auth.docker.io/token?service=registry.docker.io&scope=repository:library/alpine:pull"

然后您的图像请求是：

curl --header "Authorization: Bearer eyJh..." https://index.docker.io/v2/library/alpine/manifests/latest

然后您将得到响应。