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main.go
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main.go
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/*
* Copyright 2018-2020 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package main
import (
"encoding/xml"
"fmt"
"net/http"
"os"
"strings"
"github.com/paketo-buildpacks/pipeline-builder/actions"
)
func main() {
inputs := actions.NewInputs()
u, ok := inputs["uri"]
if !ok {
panic(fmt.Errorf("uri must be specified"))
}
g, ok := inputs["group_id"]
if !ok {
panic(fmt.Errorf("group_id must be specified"))
}
a, ok := inputs["artifact_id"]
if !ok {
panic(fmt.Errorf("artifact_id must be specified"))
}
uri := fmt.Sprintf("%s/%s/%s/maven-metadata.xml", u, strings.ReplaceAll(g, ".", "/"), a)
resp, err := http.Get(uri)
if err != nil {
panic(fmt.Errorf("unable to get %s\n%w", uri, err))
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
panic(fmt.Errorf("unable to download %s: %d", uri, resp.StatusCode))
}
var raw Metadata
if err := xml.NewDecoder(resp.Body).Decode(&raw); err != nil {
panic(fmt.Errorf("unable to decode payload\n%w", err))
}
versions := make(actions.Versions)
for _, v := range raw.Versioning.Versions {
w := fmt.Sprintf("%s/%s/%s/%s", u, strings.ReplaceAll(g, ".", "/"), a, v)
w = fmt.Sprintf("%s/%s-%s", w, a, v)
if s, ok := inputs["classifier"]; ok {
w = fmt.Sprintf("%s-%s", w, s)
}
if s, ok := inputs["packaging"]; ok {
w = fmt.Sprintf("%s.%s", w, s)
} else {
w = fmt.Sprintf("%s.jar", w)
}
n, err := actions.NormalizeVersion(v)
if err != nil {
panic(err)
}
versions[n] = w
}
if o, err := versions.GetLatest(inputs); err != nil {
panic(err)
} else {
o.Write(os.Stdout)
}
}
type Metadata struct {
Versioning Versioning `xml:"versioning"`
}
type Versioning struct {
Versions []string `xml:"versions>version"`
}