Merge pull request #95 from SumoLogic/rmiller-tf-resolve-redirection-url

Support endpoint redirection to make base_url optional

Author: Ryan Miller

go.sum

@@ -13,8 +13,6 @@ github.com/Azure/go-autorest v10.15.4+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxS
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@@ -27,6 +25,7 @@ github.com/antchfx/xquery v0.0.0-20180515051857-ad5b8c7a47b0/go.mod h1:LzD22aAzD
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@@ -60,6 +59,7 @@ github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3Ee
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@@ -75,13 +75,16 @@ github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeME
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@@ -93,6 +96,7 @@ github.com/google/go-cmp v0.2.0 h1:+dTQ8DZQJz0Mb/HjFlkptS1FeQ4cWSnN941F8aEG4SQ=
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@@ -150,11 +154,13 @@ github.com/hashicorp/hcl2 v0.0.0-20190515223218-4b22149b7cef h1:xZRvbcwHY8zhaxDw
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@@ -173,10 +179,13 @@ github.com/kardianos/osext v0.0.0-20190222173326-2bc1f35cddc0/go.mod h1:1NbS8ALr
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@@ -197,6 +206,7 @@ github.com/microcosm-cc/bluemonday v1.0.1/go.mod h1:hsXNsILzKxV+sX77C5b8FSuKF00v
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@@ -229,6 +239,7 @@ github.com/openzipkin/zipkin-go v0.1.1/go.mod h1:NtoC/o8u3JlF1lSlyPNswIbeQH9bJTm
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@@ -345,6 +359,7 @@ golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5h
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@@ -363,6 +378,7 @@ google.golang.org/api v0.1.0/go.mod h1:UGEZY7KEX120AnNLIHFMKIo4obdJhkp2tPbaPlQx1
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.2.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/appengine v1.3.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/appengine v1.4.0 h1:/wp5JvzpHIxhs/dumFmF7BXTf3Z+dd4uXta4kVyO508=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20180831171423-11092d34479b/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
@@ -376,6 +392,7 @@ google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3
 google.golang.org/grpc v1.18.0 h1:IZl7mfBGfbhYx2p2rKRtYgDFw6SBz+kclmxYrCksPPA=
 google.golang.org/grpc v1.18.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/cheggaaa/pb.v1 v1.0.27/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=

sumologic/provider.go

@@ -3,7 +3,9 @@ package sumologic
 import (
 	"fmt"
 	"log"
+	"net/http"
 	"os"
+	"strings"
 
 	"github.com/go-errors/errors"
 	"github.com/hashicorp/terraform/helper/mutexkv"
@@ -61,6 +63,26 @@ func Provider() terraform.ResourceProvider {
 
 var SumoMutexKV = mutexkv.NewMutexKV()
 
+func resolveRedirectURL(accessId string, accessKey string) (string, error) {
+	req, err := http.NewRequest(http.MethodHead, "https://api.sumologic.com/api/v1/collectors", nil)
+	if err != nil {
+		return "", err
+	}
+	req.SetBasicAuth(accessId, accessKey)
+	client := &http.Client{CheckRedirect: func(req *http.Request, via []*http.Request) error {
+		return http.ErrUseLastResponse
+	}}
+	resp, err := client.Do(req)
+	if err != nil {
+		return "", err
+	}
+	location := resp.Header.Get("location")
+	if location == "" {
+		return location, fmt.Errorf("location header not found")
+	}
+	return strings.Split(location, "v1")[0], nil
+}
+
 func providerConfigure(d *schema.ResourceData) (interface{}, error) {
 	accessId := d.Get("access_id").(string)
 	accessKey := d.Get("access_key").(string)
@@ -77,9 +99,18 @@ func providerConfigure(d *schema.ResourceData) (interface{}, error) {
 	}
 
 	if environment == "" && baseUrl == "" {
-		environment = "us2"
-		// baseUrl will be set accordingly in NewClient constructor
-		log.Printf("[WARN] environment not set, setting to %s", environment)
+		log.Printf("Attempting to resolve redirection URL from access key/id")
+		url, err := resolveRedirectURL(accessId, accessKey)
+		if err != nil {
+			log.Printf("[WARN] Unable to resolve redirection URL, %s", err)
+			environment = "us2"
+			// baseUrl will be set accordingly in NewClient constructor
+			log.Printf("[WARN] environment not set, defaulting to %s", environment)
+		} else {
+			baseUrl = url
+			log.Printf("Resolved redirection URL %s", baseUrl)
+		}
+
 	}
 
 	if msg != "" {