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add support for downloading remote modules in terraform v12 Iac scanning
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Yusuf Kanchwala
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Oct 2, 2020
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| /* | ||
| Copyright (C) 2020 Accurics, Inc. | ||
| 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 | ||
| http://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 tfv12 | ||
|
|
||
| import ( | ||
| "path/filepath" | ||
| "strings" | ||
|
|
||
| "github.com/accurics/terrascan/pkg/downloader" | ||
| "go.uber.org/zap" | ||
| ) | ||
|
|
||
| var localSourcePrefixes = []string{ | ||
| "./", | ||
| "../", | ||
| ".\\", | ||
| "..\\", | ||
| } | ||
|
|
||
| func isLocalSourceAddr(addr string) bool { | ||
| for _, prefix := range localSourcePrefixes { | ||
| if strings.HasPrefix(addr, prefix) { | ||
| return true | ||
| } | ||
| } | ||
| return false | ||
| } | ||
|
|
||
| // InstalledCache remembers the final resolved addresses of all the sources | ||
| // already downloaded. | ||
| // | ||
| // The keys in InstalledCache are resolved and trimmed source addresses | ||
| // (with a scheme always present, and without any "subdir" component), | ||
| // and the values are the paths where each source was previously installed. | ||
| type InstalledCache map[string]string | ||
|
|
||
| // DownloadModule retrieves the package referenced in the given address | ||
| // into the installation path and then returns the full path to any subdir | ||
| // indicated in the address. | ||
| func (g InstalledCache) DownloadModule(addr, destPath string) (string, error) { | ||
|
|
||
| // get url with type | ||
| URLWithType, subDir, err := downloader.GetURLWithType(addr, destPath) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| // check if the module has already been downloaded | ||
| if prevDir, exists := g[URLWithType]; exists { | ||
| zap.S().Debugf("module %q already installed at %q", URLWithType, prevDir) | ||
| destPath = prevDir | ||
| } else { | ||
| d := downloader.NewDownloader() | ||
| destPath, err := d.Download(URLWithType, destPath) | ||
| if err != nil { | ||
| zap.S().Debugf("failed to download remote module. error: '%v'", err) | ||
| return "", err | ||
| } | ||
| // Remember where we installed this so we might reuse this directory | ||
| // on subsequent calls to avoid re-downloading. | ||
| g[URLWithType] = destPath | ||
| } | ||
|
|
||
| // Our subDir string can contain wildcards until this point, so that | ||
| // e.g. a subDir of * can expand to one top-level directory in a .tar.gz | ||
| // archive. Now that we've expanded the archive successfully we must | ||
| // resolve that into a concrete path. | ||
| var finalDir string | ||
| if subDir != "" { | ||
| finalDir, err = downloader.SubDirGlob(destPath, subDir) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| zap.S().Debugf("expanded %q to %q", subDir, finalDir) | ||
| } else { | ||
| finalDir = destPath | ||
| } | ||
|
|
||
| // If we got this far then we have apparently succeeded in downloading | ||
| // the requested object! | ||
| return filepath.Clean(finalDir), nil | ||
| } |