feat(renderer): allow templates to be retrieved from URL (#41)

.conform.yaml

@@ -23,44 +23,7 @@ policies:
 
 script:
   template: |
-    #!/bin/bash
-
-    set -e
-
-    # Only run if not a PR.
-    if [[ "${TRAVIS_PULL_REQUEST}" != "false" ]]; then
-      exit 0
-    fi
-
-    if [[ "${TRAVIS_BRANCH}" == "master" ]] || [[ ! -z "${TRAVIS_TAG}" ]]; then
-      # Check if working tree is clean.
-      if [[ "{{ .Git.IsClean }}" != "true" ]]; then
-        echo "The working tree is dirty."
-        exit 1
-      fi
-
-      echo "Pushing image {{ .Docker.Image }}"
-      docker login -u "${DOCKER_USERNAME}" -p "${DOCKER_PASSWORD}"
-      docker push {{ .Docker.Image }}
-
-      # Check if ref is a tag.
-      if [[ "{{ .Git.IsTag }}" != "true" ]]; then
-        exit 0
-      fi
-
-      # Check if the tag is a prerelease.
-      if [[ "{{ .Version.IsPrerelease }}" == "true" ]]; then
-        echo "Publishing prerelease {{ .Version.Major }}.{{ .Version.Minor }}.{{ .Version.Patch }}-{{ .Version.Prerelease }}"
-        docker tag {{ .Docker.Image }} {{ .Repository }}:{{ .Version.Major }}.{{ .Version.Minor }}.{{ .Version.Patch }}-{{ .Version.Prerelease }}
-        docker push {{ .Repository }}:{{ .Version.Major }}.{{ .Version.Minor }}.{{ .Version.Patch }}-{{ .Version.Prerelease }}
-      else
-        echo "Publishing release {{ .Version.Major }}.{{ .Version.Minor }}.{{ .Version.Patch }}"
-        docker tag {{ .Docker.Image }} {{ .Repository }}:{{ .Version.Major }}.{{ .Version.Minor }}.{{ .Version.Patch }}
-        docker push {{ .Repository }}:{{ .Version.Major }}.{{ .Version.Minor }}.{{ .Version.Patch }}
-        docker tag {{ .Docker.Image }} {{ .Repository }}:latest
-        docker push {{ .Repository }}:latest
-      fi
-    fi
+    {{ fromURL "https://raw.githubusercontent.com/autonomy/conform-templates/master/docker/deploy.sh" }}
 
 pipeline:
   stages:
@@ -94,10 +57,7 @@ tasks:
       {{ end }}
   test:
     template: |
-      FROM autonomy/golang:1.8.3 as test
-      WORKDIR $GOPATH/src/github.com/{{ .Repository }}
-      COPY ./ ./
-      RUN test.sh
+      {{ fromURL "https://raw.githubusercontent.com/autonomy/conform-templates/master/golang/Dockerfile.test" }}
   image:
     template: |
       FROM alpine:3.6 as image

pkg/renderer/renderer.go

@@ -2,6 +2,9 @@ package renderer
 
 import (
 	"bytes"
+	"fmt"
+	"io/ioutil"
+	"net/http"
 	"text/template"
 
 	"github.com/Masterminds/sprig"
@@ -14,7 +17,8 @@ type Renderer struct{}
 // Render renders a template.
 func (r *Renderer) Render(m *metadata.Metadata, s string) (string, error) {
 	var wr bytes.Buffer
-	tmpl, err := template.New("").Funcs(sprig.TxtFuncMap()).Parse(s)
+	funcMap := makeFuncMap(m)
+	tmpl, err := template.New("").Funcs(funcMap).Parse(s)
 	if err != nil {
 		return "", err
 	}
@@ -36,3 +40,37 @@ func RenderTemplate(contents string, metadata *metadata.Metadata) (string, error
 
 	return rendered, nil
 }
+
+func makeFuncMap(m *metadata.Metadata) template.FuncMap {
+	funcMap := sprig.TxtFuncMap()
+
+	funcMap["fromURL"] = func(url string) (string, error) {
+		resp, err := http.Get(url)
+		if err != nil {
+			return "", err
+		}
+		defer func() {
+			_err := resp.Body.Close()
+			if _err != nil {
+				fmt.Printf("Failed to close the response body: %#v", _err)
+			}
+		}()
+		if resp.StatusCode != http.StatusOK {
+			return "", fmt.Errorf("Failed to download from URL: %d", resp.StatusCode)
+		}
+
+		b, err := ioutil.ReadAll(resp.Body)
+		if err != nil {
+			return "", err
+		}
+
+		rendered, err := RenderTemplate(string(b), m)
+		if err != nil {
+			return "", err
+		}
+
+		return rendered, nil
+	}
+
+	return funcMap
+}