From b63d740c18a2082cd1f8fed7d7c448c14091868c Mon Sep 17 00:00:00 2001
From: Leo Zhang <leo@fossa.io>
Date: Tue, 13 Feb 2018 21:08:26 -0800
Subject: [PATCH] feat(mvn): add Maven support + test fixture

---
 .gitmodules         |   3 +
 build/golang.go     |   2 -
 build/maven.go      | 148 ++++++++++++++++++++++++++++++++++++++++++++
 test/fixtures/maven |   1 +
 4 files changed, 152 insertions(+), 2 deletions(-)
 create mode 100644 .gitmodules
 create mode 160000 test/fixtures/maven

diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000000..8ae8c2584a
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "test/fixtures/maven"]
+	path = test/fixtures/maven
+	url = git@github.com:apache/maven.git
diff --git a/build/golang.go b/build/golang.go
index 5894979e6d..17899d91b5 100644
--- a/build/golang.go
+++ b/build/golang.go
@@ -555,12 +555,10 @@ func (builder *GoBuilder) IsBuilt(m module.Module, allowUnresolved bool) (bool,
 	return true, nil
 }
 
-// IsBuilt checks whether dependencies are ready for scanning.
 func (builder *GoBuilder) IsModule(target string) (bool, error) {
 	return false, errors.New("IsModule is not implemented for GoBuilder")
 }
 
-// IsBuilt checks whether dependencies are ready for scanning.
 func (builder *GoBuilder) InferModule(target string) (module.Module, error) {
 	return module.Module{}, errors.New("InferModule is not implemented for GoBuilder")
 }
diff --git a/build/maven.go b/build/maven.go
index 5c93a93534..e51fb5220a 100644
--- a/build/maven.go
+++ b/build/maven.go
@@ -1 +1,149 @@
 package build
+
+import (
+	"errors"
+	"os"
+	"os/exec"
+	"regexp"
+	"strings"
+
+	"github.com/fossas/fossa-cli/module"
+	logging "github.com/op/go-logging"
+)
+
+var mavenLogger = logging.MustGetLogger("maven")
+
+// MavenArtifact implements Dependency for Maven builds
+type MavenArtifact struct {
+	Name    string `json:"name"`
+	Version string `json:"version"`
+}
+
+// Fetcher always returns mvn for MavenArtifact
+func (m MavenArtifact) Fetcher() string {
+	return "mvn"
+}
+
+// Package returns the package spec for MavenArtifact
+func (m MavenArtifact) Package() string {
+	return m.Name
+}
+
+// Revision returns the version spec for MavenArtifact
+func (m MavenArtifact) Revision() string {
+	return m.Version
+}
+
+// MavenBuilder implements Builder for Apache Maven (*.pom.xml) builds
+type MavenBuilder struct {
+	MvnCmd     string
+	MvnVersion string
+
+	JavaCmd     string
+	JavaVersion string
+}
+
+func (builder *MavenBuilder) Initialize() error {
+	builder.MvnCmd = string(os.Getenv("MVN_BINARY"))
+	if builder.MvnCmd == "" {
+		builder.MvnCmd = "mvn"
+	}
+
+	mavenVersionOutput, err := exec.Command(builder.MvnCmd, "-v").Output()
+	if err != nil {
+		return err
+	}
+	if len(mavenVersionOutput) >= 10 { // x.x.x
+		outputMatchRe := regexp.MustCompile(`Apache Maven ([0-9]+\.[0-9]+\.[0-9]+)`)
+		match := outputMatchRe.FindStringSubmatch(strings.TrimSpace(string(mavenVersionOutput)))
+		if len(match) == 2 {
+			builder.MvnVersion = match[1]
+		}
+	}
+
+	if builder.MvnCmd == "" || builder.MvnVersion == "" {
+		return errors.New("could not find mvn (try setting $MVN_BINARY)")
+	}
+
+	// TODO: collect Java information
+
+	return nil
+}
+
+func (builder *MavenBuilder) Build(m module.Module, force bool) error {
+	mavenLogger.Debugf("Running Maven build")
+	if force {
+		mavenLogger.Debugf("`force` flag is set: clearing install cache.")
+		mavenLogger.Debugf("Running `mvn clean`...")
+		cmd := exec.Command(builder.MvnCmd, "clean")
+		cmd.Dir = m.Dir
+		output, err := cmd.Output()
+		mavenLogger.Debugf("...running `mvn clean` done: %#v", string(output))
+		if err != nil {
+			return err
+		}
+	}
+
+	mavenLogger.Debugf("Running `mvn install -DskipTests -Drat.skip=true`...")
+	cmd := exec.Command(builder.MvnCmd, "install", "-DskipTests", "-Drat.skip=true")
+	cmd.Dir = m.Dir
+	output, err := cmd.Output()
+	mavenLogger.Debugf("...running `mvn install -DskipTests -Drat.skip=true` done: %#v", string(output))
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (builder *MavenBuilder) Analyze(m module.Module, _ bool) ([]module.Dependency, error) {
+	mavenLogger.Debugf("Running Maven analysis")
+	cmd := exec.Command(builder.MvnCmd, "dependency:list")
+	cmd.Dir = m.Dir
+	output, err := cmd.Output()
+	if err != nil {
+		return nil, err
+	}
+
+	deps := []module.Dependency{}
+	outputMatchRe := regexp.MustCompile(`\[INFO\]    ([^:]+):([^:]+):(jar|war|java-source|):([^:]+)`)
+	for _, bundleListLn := range strings.Split(string(output), "\n") {
+		bundleListLn = strings.TrimSpace(bundleListLn)
+		if len(bundleListLn) > 0 {
+			match := outputMatchRe.FindStringSubmatch(bundleListLn)
+			if len(match) == 5 {
+				deps = append(deps, module.Dependency(MavenArtifact{
+					Name:    match[1] + ":" + match[2],
+					Version: match[4],
+				}))
+			}
+		}
+	}
+
+	return deps, nil
+}
+
+// IsBuilt checks whether dependencies are ready for scanning.
+func (builder *MavenBuilder) IsBuilt(m module.Module, _ bool) (bool, error) {
+	mavenLogger.Debugf("Running `mvn dependency:list` for IsBuilt...")
+	cmd := exec.Command(builder.MvnCmd, "dependency:list")
+	cmd.Dir = m.Dir
+	output, err := cmd.Output()
+	outStr := string(output)
+	mavenLogger.Debugf("...running `mvn dependency:list` done: %#v", outStr)
+	if err != nil {
+		if strings.Index(outStr, "Could not find artifact") != -1 {
+			return false, nil
+		}
+		return false, err
+	}
+	return outStr != "", nil
+}
+
+func (builder *MavenBuilder) IsModule(target string) (bool, error) {
+	return false, errors.New("IsModule is not implemented for MavenBuilder")
+}
+
+func (builder *MavenBuilder) InferModule(target string) (module.Module, error) {
+	return module.Module{}, errors.New("InferModule is not implemented for MavenBuilder")
+}
diff --git a/test/fixtures/maven b/test/fixtures/maven
new file mode 160000
index 0000000000..cd34b08df1
--- /dev/null
+++ b/test/fixtures/maven
@@ -0,0 +1 @@
+Subproject commit cd34b08df1f378b44fae3d8020aa1fda8089dc79