From e63a982deebff5b25f30bad4f07639f72038abd7 Mon Sep 17 00:00:00 2001
From: Harshavardhana <harsha@harshavardhana.net>
Date: Wed, 3 Feb 2016 22:46:45 -0800
Subject: [PATCH] api: Implement About API.

---
 web-definitions.go | 45 ++++++++++++++++++++++++++++-----------------
 web-handlers.go    | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+), 17 deletions(-)

diff --git a/web-definitions.go b/web-definitions.go
index ddcbd82f7..ff245e6b7 100644
--- a/web-definitions.go
+++ b/web-definitions.go
@@ -26,6 +26,9 @@ type MakeBucketArgs struct {
 // DiskInfoArgs - disk info args.
 type DiskInfoArgs struct{}
 
+// ServerInfoArgs  - server info args.
+type ServerInfoArgs struct{}
+
 // ListBucketsArgs - list bucket args.
 type ListBucketsArgs struct{}
 
@@ -35,6 +38,20 @@ type ListObjectsArgs struct {
 	Prefix     string `json:"prefix"`
 }
 
+// PutObjectURLArgs - args to generate url for upload access.
+type PutObjectURLArgs struct {
+	TargetHost string `json:"targetHost"`
+	BucketName string `json:"bucketName"`
+	ObjectName string `json:"objectName"`
+}
+
+// GetObjectURLArgs - args to generate url for download access.
+type GetObjectURLArgs struct {
+	TargetHost string `json:"targetHost"`
+	BucketName string `json:"bucketName"`
+	ObjectName string `json:"objectName"`
+}
+
 // BucketInfo container for list buckets metadata.
 type BucketInfo struct {
 	// The name of the bucket.
@@ -55,27 +72,21 @@ type ObjectInfo struct {
 	ContentType string `json:"contentType"`
 }
 
-// PutObjectURLArgs - args to generate url for upload access.
-type PutObjectURLArgs struct {
-	TargetHost string `json:"targetHost"`
-	BucketName string `json:"bucketName"`
-	ObjectName string `json:"objectName"`
-}
-
-// GetObjectURLArgs - args to generate url for download access.
-type GetObjectURLArgs struct {
-	TargetHost string `json:"targetHost"`
-	BucketName string `json:"bucketName"`
-	ObjectName string `json:"objectName"`
+// LoginArgs - login arguments.
+type LoginArgs struct {
+	Username string `json:"username" form:"username"`
+	Password string `json:"password" form:"password"`
 }
 
-// AuthToken - auth token reply
+// AuthToken - auth token reply.
 type AuthToken struct {
 	Token string `json:"token" form:"token"`
 }
 
-// LoginArgs - login arguments.
-type LoginArgs struct {
-	Username string `json:"username" form:"username"`
-	Password string `json:"password" form:"password"`
+// ServerInfo - server info reply.
+type ServerInfo struct {
+	MinioVersion  string
+	MinioMemory   string
+	MinioPlatform string
+	MinioRuntime  string
 }
diff --git a/web-handlers.go b/web-handlers.go
index 819dbab8d..eedd90387 100644
--- a/web-handlers.go
+++ b/web-handlers.go
@@ -20,10 +20,14 @@ import (
 	"fmt"
 	"net"
 	"net/http"
+	"os"
+	"runtime"
+	"strconv"
 	"strings"
 	"time"
 
 	jwtgo "github.com/dgrijalva/jwt-go"
+	"github.com/dustin/go-humanize"
 	"github.com/minio/minio-go"
 	"github.com/minio/minio-xl/pkg/probe"
 	"github.com/minio/minio/pkg/disk"
@@ -45,6 +49,36 @@ func isAuthenticated(req *http.Request) bool {
 	return tokenRequest.Valid
 }
 
+// ServerInfo - get server info.
+func (web *WebAPI) ServerInfo(r *http.Request, args *ServerInfoArgs, reply *ServerInfo) error {
+	if !isAuthenticated(r) {
+		return errUnAuthorizedRequest
+	}
+	host, err := os.Hostname()
+	if err != nil {
+		host = ""
+	}
+	memstats := &runtime.MemStats{}
+	runtime.ReadMemStats(memstats)
+	mem := fmt.Sprintf("Used: %s | Allocated: %s | Used-Heap: %s | Allocated-Heap: %s",
+		humanize.Bytes(memstats.Alloc),
+		humanize.Bytes(memstats.TotalAlloc),
+		humanize.Bytes(memstats.HeapAlloc),
+		humanize.Bytes(memstats.HeapSys))
+	platform := fmt.Sprintf("Host: %s | OS: %s | Arch: %s",
+		host,
+		runtime.GOOS,
+		runtime.GOARCH)
+	goruntime := fmt.Sprintf("Version: %s | CPUs: %s", runtime.Version(), strconv.Itoa(runtime.NumCPU()))
+	serverInfo := ServerInfo{}
+	serverInfo.MinioVersion = minioVersion
+	serverInfo.MinioMemory = mem
+	serverInfo.MinioPlatform = platform
+	serverInfo.MinioRuntime = goruntime
+	*reply = serverInfo
+	return nil
+}
+
 // DiskInfo - get disk statistics.
 func (web *WebAPI) DiskInfo(r *http.Request, args *DiskInfoArgs, reply *disk.Info) error {
 	if !isAuthenticated(r) {