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Signed-off-by: Paul Grant <paulfgrant01@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| package httpjson | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "strconv" | ||
| "strings" | ||
|
|
||
| "github.com/antchfx/jsonquery" | ||
| "github.com/helmfile/vals/pkg/api" | ||
| "github.com/helmfile/vals/pkg/log" | ||
| ) | ||
|
|
||
| type provider struct { | ||
| // Keeping track of httpjson services since we need a service per url | ||
| protocol string | ||
| log *log.Logger | ||
| docs map[string]*jsonquery.Node | ||
| floatAsInt bool | ||
| } | ||
|
|
||
| func New(l *log.Logger, cfg api.StaticConfig) *provider { | ||
| p := &provider{ | ||
| log: l, | ||
| } | ||
|
|
||
| // Should the protocol be insecure i.e. http | ||
| insecureArg := cfg.String("insecure") | ||
| p.protocol = "https" | ||
| if insecureArg == "true" { | ||
| p.protocol = "http" | ||
| } | ||
|
|
||
| // By default JSON will return large integers as float64 | ||
| floatAsIntArg := cfg.String("floatAsInt") | ||
| p.floatAsInt = false | ||
| if floatAsIntArg == "true" { | ||
| p.floatAsInt = true | ||
| } | ||
|
|
||
| // Initialize docs map to store the json object for use multiple times | ||
| if len(p.docs) == 0 { | ||
| p.docs = make(map[string]*jsonquery.Node) | ||
| } | ||
|
|
||
| return p | ||
| } | ||
|
|
||
| func GetXpathFromUri(uri string) (xpath string, err error) { | ||
| found := strings.Split(uri, "mode=singleparam#")[1] | ||
| found = strings.Split(found, "&")[0] | ||
| xpath = strings.TrimPrefix(found, "/") | ||
|
|
||
| return xpath, nil | ||
| } | ||
|
|
||
| func getUrlFromUri(uri string, protocol string) (string, error) { | ||
| uriParts := strings.Split(uri, "?") | ||
| if len(uriParts) < 2 { | ||
| return "", fmt.Errorf("error getting url from uri: %v, ensure xpath singleparam is set as a query parameter", uri) | ||
| } | ||
| url := strings.Replace(uriParts[0], "httpjson", protocol, 1) | ||
|
|
||
| return url, nil | ||
| } | ||
|
|
||
| func (p *provider) GetJsonDoc(url string) error { | ||
| if _, ok := p.docs[url]; !ok { | ||
| doc, err := jsonquery.LoadURL(url) | ||
| if err != nil { | ||
| return fmt.Errorf("error fetching json document at %v: %v", url, err) | ||
| } | ||
| p.docs[url] = doc | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (p *provider) GetString(uri string) (string, error) { | ||
| url, err := getUrlFromUri(uri, p.protocol) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| err = p.GetJsonDoc(url) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| xpathQuery, err := GetXpathFromUri(uri) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| returnValue := "" | ||
| var values []string | ||
| node, err := jsonquery.Query(p.docs[url], xpathQuery) | ||
| if err != nil || node == nil { | ||
| return "", fmt.Errorf("unable to query doc for value with xpath query using %v", uri) | ||
| } | ||
|
|
||
| if node.FirstChild.Data != node.LastChild.Data { | ||
| return "", fmt.Errorf("location %v has child nodes at %v, please use a more granular query", xpathQuery, url) | ||
| } | ||
|
|
||
| childNodesLength := countChildNodes(node) | ||
|
|
||
| if childNodesLength > 1 { | ||
| for child := node.FirstChild; child != nil; child = child.NextSibling { | ||
| values = append(values, child.Value().(string)) | ||
| } | ||
| returnValue = strings.Join(values, ",") | ||
|
|
||
| } else { | ||
| returnValue = node.FirstChild.Value().(string) | ||
| } | ||
|
|
||
| if p.floatAsInt { | ||
| intValue, err := strconv.ParseFloat(returnValue, 64) | ||
| if err != nil { | ||
| return "", fmt.Errorf("unable to convert possible float to int for value: %v", returnValue) | ||
| } | ||
| returnValue = fmt.Sprintf("%.0f", intValue) | ||
| } | ||
|
|
||
| return returnValue, nil | ||
| } | ||
|
|
||
| func countChildNodes(node *jsonquery.Node) int { | ||
| count := 0 | ||
| for child := node.FirstChild; child != nil; child = child.NextSibling { | ||
| count++ | ||
| } | ||
| return count | ||
| } | ||
|
|
||
| func (p *provider) GetStringMap(key string) (map[string]interface{}, error) { | ||
| return nil, fmt.Errorf("we should not be in the GetStringMap method") | ||
| } |
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