Filter JSON returned from GitHub API via Go-CodePudding

I'm trying to get the latest release information from a github repository and grab a specific asset in that release. The following code prints out the release tag and the all the assets under the Asset structure. I'd like to be able to pull out a specific item and its download url, such as just the ajour.exe tag. Can I do that via the struct, or should I be parsing the output to grab it?

func GetGithubAsset() {
    testUri := "https://api.github.com/repos/ajour/ajour/releases/latest"
    type githubApiData struct {
       AppVersion string `json:"tag_name"`
       Assets     []struct {
          Name               string `json:"name"`
          BrowserDownloadURL string `json:"browser_download_url"`
       }
    }
    resp, err := http.Get(testUri)
    if err != nil {
        log.Fatal(err)
    }
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        log.Fatal(err)
    }
    var data githubApiData
    jsonErr := json.Unmarshal(body, &data)
    if jsonErr != nil {
        log.Fatal(jsonErr)
    }
    fmt.Println(data.AppVersion)
    fmt.Println(data.Assets)
}

CodePudding user response：

You're almost there. Note that the json.Unmarshal does parse the output for you. All you need to is loop through the Assets field, something like so (in place of fmt.Println(data.Assets)):

    for _, asset := range data.Assets {
        if asset.Name == "ajour.exe" {
            fmt.Println(asset.BrowserDownloadURL)
        }
    }

CodePudding user response：

The json tag json:"assets" is missing

func GetGithubAsset() {
    testUri := "https://api.github.com/repos/ajour/ajour/releases/latest"
    type githubApiData struct {
        AppVersion string `json:"tag_name"`
        Assets     []struct {
            Name               string `json:"name"`
            BrowserDownloadURL string `json:"browser_download_url"`
        } `json:"assets"`
    }
    resp, err := http.Get(testUri)
    if err != nil {
        log.Fatal(err)
    }
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        log.Fatal(err)
    }
    var data githubApiData
    jsonErr := json.Unmarshal(body, &data)
    if jsonErr != nil {
        log.Fatal(jsonErr)
    }
    fmt.Println(data.AppVersion)
    fmt.Println(data.Assets)
}