Add DNS challenge provider for namecheap.

CHANGELOG.md

@@ -3,12 +3,12 @@
 ## Unreleased
 
 ### Added:
-- CLI: The `--dns` switch. To include the DNS challenge for consideration. Supported are the following solvers: cloudflare, digitalocean, dnsimple, gandi, route53, rfc2136 and manual.
+- CLI: The `--dns` switch. To include the DNS challenge for consideration. Supported are the following solvers: cloudflare, digitalocean, dnsimple, gandi, namecheap, route53, rfc2136 and manual.
 - CLI: The `--accept-tos`  switch. Indicates your acceptance of the Let's Encrypt terms of service without prompting you.
 - lib: A new type for challenge identifiers `Challenge`
 - lib: A new interface for custom challenge providers `ChallengeProvider`
 - lib: SetChallengeProvider function. Pass a challenge identifier and a Provider to replace the default behaviour of a challenge.
-- lib: The DNS-01 challenge has been implemented with modular solvers using the `ChallengeProvider` interface. Included solvers are: cloudflare, digitalocean, dnsimple, gandi, route53, rfc2136 and manual.
+- lib: The DNS-01 challenge has been implemented with modular solvers using the `ChallengeProvider` interface. Included solvers are: cloudflare, digitalocean, dnsimple, gandi, namecheap, route53, rfc2136 and manual.
 
 ### Changed
 - lib: ExcludeChallenges now expects to be passed an array of `Challenge` types.

README.md

@@ -99,6 +99,7 @@ GLOBAL OPTIONS:
 									digitalocean: DO_AUTH_TOKEN
 									dnsimple: DNSIMPLE_EMAIL, DNSIMPLE_API_KEY
 									gandi: GANDI_API_KEY
+									namecheap: NAMECHEAP_API_USER, NAMECHEAP_API_KEY
 									route53: AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_REGION
 									rfc2136: RFC2136_TSIG_KEY, RFC2136_TSIG_SECRET, RFC2136_TSIG_ALGORITHM, RFC2136_NAMESERVER
 									manual: none

cli.go

@@ -138,6 +138,7 @@ func main() {
 				"\n\tdigitalocean: DO_AUTH_TOKEN" +
 				"\n\tdnsimple: DNSIMPLE_EMAIL, DNSIMPLE_API_KEY" +
 				"\n\tgandi: GANDI_API_KEY" +
+				"\n\tnamecheap: NAMECHEAP_API_USER, NAMECHEAP_API_KEY" +
 				"\n\troute53: AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_REGION" +
 				"\n\trfc2136: RFC2136_TSIG_KEY, RFC2136_TSIG_SECRET, RFC2136_TSIG_ALGORITHM, RFC2136_NAMESERVER" +
 				"\n\tmanual: none",

cli_handlers.go

@@ -15,6 +15,7 @@ import (
 	"github.com/xenolf/lego/providers/dns/digitalocean"
 	"github.com/xenolf/lego/providers/dns/dnsimple"
 	"github.com/xenolf/lego/providers/dns/gandi"
+	"github.com/xenolf/lego/providers/dns/namecheap"
 	"github.com/xenolf/lego/providers/dns/rfc2136"
 	"github.com/xenolf/lego/providers/dns/route53"
 	"github.com/xenolf/lego/providers/http/webroot"
@@ -62,7 +63,7 @@ func setup(c *cli.Context) (*Configuration, *Account, *acme.Client) {
 		}
 
 		client.SetChallengeProvider(acme.HTTP01, provider)
-		
+
 		// --webroot=foo indicates that the user specifically want to do a HTTP challenge
 		// infer that the user also wants to exclude all other challenges
 		client.ExcludeChallenges([]acme.Challenge{acme.DNS01, acme.TLSSNI01})
@@ -96,6 +97,8 @@ func setup(c *cli.Context) (*Configuration, *Account, *acme.Client) {
 		case "gandi":
 			apiKey := os.Getenv("GANDI_API_KEY")
 			provider, err = gandi.NewDNSProvider(apiKey)
+		case "namecheap":
+			provider, err = namecheap.NewDNSProvider("", "")
 		case "route53":
 			awsRegion := os.Getenv("AWS_REGION")
 			provider, err = route53.NewDNSProvider("", "", awsRegion)

providers/dns/namecheap/namecheap.go

@@ -0,0 +1,409 @@
+// Package namecheap implements a DNS provider for solving the DNS-01
+// challenge using namecheap DNS.
+package namecheap
+
+import (
+	"encoding/xml"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/xenolf/lego/acme"
+)
+
+// Notes about namecheap's tool API:
+// 1. Using the API requires registration. Once registered, use your account
+//    name and API key to access the API.
+// 2. There is no API to add or modify a single DNS record. Instead you must
+//    read the entire list of records, make modifications, and then write the
+//    entire updated list of records.  (Yuck.)
+// 3. Namecheap's DNS updates can be slow to propagate. I've seen them take
+//    as long as an hour.
+// 4. Namecheap requires you to whitelist the IP address from which you call
+//    its APIs. It also requires all API calls to include the whitelisted IP
+//    address as a form or query string value. This code uses a namecheap
+//    service to query the client's IP address.
+
+var (
+	debug          = false
+	defaultBaseURL = "https://api.namecheap.com/xml.response"
+	getIpURL       = "https://dynamicdns.park-your-domain.com/getip"
+)
+
+// DNSProvider is an implementation of the ChallengeProviderTimeout interface
+// that uses Namecheap's tool API to manage TXT records for a domain.
+type DNSProvider struct {
+	baseURL  string
+	apiUser  string
+	apiKey   string
+	clientIP string
+}
+
+// NewDNSProvider returns a new DNSProvider instance. apiUser is the namecheap
+// API user's account name, and apiKey is the account's API access key.
+func NewDNSProvider(apiUser, apiKey string) (*DNSProvider, error) {
+	if apiUser == "" || apiKey == "" {
+		apiUser = os.Getenv("NAMECHEAP_API_USER")
+		apiKey = os.Getenv("NAMECHEAP_API_KEY")
+		if apiUser == "" || apiKey == "" {
+			return nil, fmt.Errorf("Namecheap credentials missing")
+		}
+	}
+
+	clientIP, err := getClientIP()
+	if err != nil {
+		return nil, err
+	}
+
+	return &DNSProvider{
+		baseURL:  defaultBaseURL,
+		apiUser:  apiUser,
+		apiKey:   apiKey,
+		clientIP: clientIP,
+	}, nil
+}
+
+// Namecheap can sometimes take a long time to complete an update, so wait
+// up to 60 minutes for the update to propagate.
+func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
+	return 60 * time.Minute, 15 * time.Second
+}
+
+// host describes a DNS record returned by the Namecheap DNS gethosts API.
+// Namecheap uses the term "host" to refer to all DNS records that include
+// a host field (A, AAAA, CNAME, NS, TXT, URL).
+type host struct {
+	Type    string `xml:",attr"`
+	Name    string `xml:",attr"`
+	Address string `xml:",attr"`
+	MXPref  string `xml:",attr"`
+	TTL     string `xml:",attr"`
+}
+
+// apierror describes an error record in a namecheap API response.
+type apierror struct {
+	Number      int    `xml:",attr"`
+	Description string `xml:",innerxml"`
+}
+
+// getClientIP returns the client's public IP address. It uses namecheap's
+// IP discovery service to perform the lookup.
+func getClientIP() (addr string, err error) {
+	resp, err := http.Get(getIpURL)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	clientIP, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return "", err
+	}
+
+	if debug {
+		fmt.Println("Client IP:", string(clientIP))
+	}
+	return string(clientIP), nil
+}
+
+// A challenge repesents all the data needed to specify a dns-01 challenge
+// to lets-encrypt.
+type challenge struct {
+	domain   string
+	key      string
+	keyFqdn  string
+	keyValue string
+	tld      string
+	sld      string
+	host     string
+}
+
+// newChallenge builds a challenge record from a domain name, a challenge
+// authentication key, and a map of available TLDs.
+func newChallenge(domain, keyAuth string, tlds map[string]string) (*challenge, error) {
+	domain = acme.UnFqdn(domain)
+	parts := strings.Split(domain, ".")
+
+	// Find the longest matching TLD.
+	longest := -1
+	for i := len(parts); i > 0; i-- {
+		t := strings.Join(parts[i-1:], ".")
+		if _, found := tlds[t]; found {
+			longest = i - 1
+		}
+	}
+	if longest < 1 {
+		return nil, fmt.Errorf("Invalid domain name '%s'", domain)
+	}
+
+	tld := strings.Join(parts[longest:], ".")
+	sld := parts[longest-1]
+
+	var host string
+	if longest >= 1 {
+		host = strings.Join(parts[:longest-1], ".")
+	}
+
+	key, keyValue, _ := acme.DNS01Record(domain, keyAuth)
+
+	return &challenge{
+		domain:   domain,
+		key:      "_acme-challenge." + host,
+		keyFqdn:  key,
+		keyValue: keyValue,
+		tld:      tld,
+		sld:      sld,
+		host:     host,
+	}, nil
+}
+
+// setGlobalParams adds the namecheap global parameters to the provided url
+// Values record.
+func (d *DNSProvider) setGlobalParams(v *url.Values, cmd string) {
+	v.Set("ApiUser", d.apiUser)
+	v.Set("ApiKey", d.apiKey)
+	v.Set("UserName", d.apiUser)
+	v.Set("ClientIp", d.clientIP)
+	v.Set("Command", cmd)
+}
+
+// getTLDs requests the list of available TLDs from namecheap.
+func (d *DNSProvider) getTLDs() (tlds map[string]string, err error) {
+	values := make(url.Values)
+	d.setGlobalParams(&values, "namecheap.domains.getTldList")
+
+	reqURL, _ := url.Parse(d.baseURL)
+	reqURL.RawQuery = values.Encode()
+
+	resp, err := http.Get(reqURL.String())
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= 400 {
+		return nil, fmt.Errorf("getHosts HTTP error %d", resp.StatusCode)
+	}
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	type GetTldsResponse struct {
+		XMLName xml.Name   `xml:"ApiResponse"`
+		Errors  []apierror `xml:"Errors>Error"`
+		Result  []struct {
+			Name string `xml:",attr"`
+		} `xml:"CommandResponse>Tlds>Tld"`
+	}
+
+	var gtr GetTldsResponse
+	if err := xml.Unmarshal(body, &gtr); err != nil {
+		return nil, err
+	}
+	if len(gtr.Errors) > 0 {
+		return nil, fmt.Errorf("Namecheap error: %s [%d]",
+			gtr.Errors[0].Description, gtr.Errors[0].Number)
+	}
+
+	tlds = make(map[string]string)
+	for _, t := range gtr.Result {
+		tlds[t.Name] = t.Name
+	}
+	return tlds, nil
+}
+
+// getHosts reads the full list of DNS host records using the Namecheap API.
+func (d *DNSProvider) getHosts(ch *challenge) (hosts []host, err error) {
+	values := make(url.Values)
+	d.setGlobalParams(&values, "namecheap.domains.dns.getHosts")
+	values.Set("SLD", ch.sld)
+	values.Set("TLD", ch.tld)
+
+	reqURL, _ := url.Parse(d.baseURL)
+	reqURL.RawQuery = values.Encode()
+
+	resp, err := http.Get(reqURL.String())
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= 400 {
+		return nil, fmt.Errorf("getHosts HTTP error %d", resp.StatusCode)
+	}
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	type GetHostsResponse struct {
+		XMLName xml.Name   `xml:"ApiResponse"`
+		Status  string     `xml:"Status,attr"`
+		Errors  []apierror `xml:"Errors>Error"`
+		Hosts   []host     `xml:"CommandResponse>DomainDNSGetHostsResult>host"`
+	}
+
+	var ghr GetHostsResponse
+	if err = xml.Unmarshal(body, &ghr); err != nil {
+		return nil, err
+	}
+	if len(ghr.Errors) > 0 {
+		return nil, fmt.Errorf("Namecheap error: %s [%d]",
+			ghr.Errors[0].Description, ghr.Errors[0].Number)
+	}
+
+	return ghr.Hosts, nil
+}
+
+// setHosts writes the full list of DNS host records using the Namecheap API.
+func (d *DNSProvider) setHosts(ch *challenge, hosts []host) error {
+	values := make(url.Values)
+	d.setGlobalParams(&values, "namecheap.domains.dns.setHosts")
+	values.Set("SLD", ch.sld)
+	values.Set("TLD", ch.tld)
+
+	for i, h := range hosts {
+		ind := fmt.Sprintf("%d", i+1)
+		values.Add("HostName"+ind, h.Name)
+		values.Add("RecordType"+ind, h.Type)
+		values.Add("Address"+ind, h.Address)
+		values.Add("MXPref"+ind, h.MXPref)
+		values.Add("TTL"+ind, h.TTL)
+	}
+
+	resp, err := http.PostForm(d.baseURL, values)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= 400 {
+		return fmt.Errorf("setHosts HTTP error %d", resp.StatusCode)
+	}
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return err
+	}
+
+	type SetHostsResponse struct {
+		XMLName xml.Name   `xml:"ApiResponse"`
+		Status  string     `xml:"Status,attr"`
+		Errors  []apierror `xml:"Errors>Error"`
+		Result  struct {
+			IsSuccess string `xml:",attr"`
+		} `xml:"CommandResponse>DomainDNSSetHostsResult"`
+	}
+
+	var shr SetHostsResponse
+	if err := xml.Unmarshal(body, &shr); err != nil {
+		return err
+	}
+	if len(shr.Errors) > 0 {
+		return fmt.Errorf("Namecheap error: %s [%d]",
+			shr.Errors[0].Description, shr.Errors[0].Number)
+	}
+	if shr.Result.IsSuccess != "true" {
+		return fmt.Errorf("Namecheap setHosts failed.")
+	}
+
+	return nil
+}
+
+// addChallengeRecord adds a DNS challenge TXT record to a list of namecheap
+// host records.
+func (d *DNSProvider) addChallengeRecord(ch *challenge, hosts *[]host) {
+	host := host{
+		Name:    ch.key,
+		Type:    "TXT",
+		Address: ch.keyValue,
+		MXPref:  "10",
+		TTL:     "120",
+	}
+
+	// If there's already a TXT record with the same name, replace it.
+	for i, h := range *hosts {
+		if h.Name == ch.key && h.Type == "TXT" {
+			(*hosts)[i] = host
+			return
+		}
+	}
+
+	// No record was replaced, so add a new one.
+	*hosts = append(*hosts, host)
+}
+
+// removeChallengeRecord removes a DNS challenge TXT record from a list of
+// namecheap host records. Return true if a record was removed.
+func (d *DNSProvider) removeChallengeRecord(ch *challenge, hosts *[]host) bool {
+	// Find the challenge TXT record and remove it if found.
+	for i, h := range *hosts {
+		if h.Name == ch.key && h.Type == "TXT" {
+			*hosts = append((*hosts)[:i], (*hosts)[i+1:]...)
+			return true
+		}
+	}
+
+	return false
+}
+
+// Present installs a TXT record for the DNS challenge.
+func (d *DNSProvider) Present(domain, token, keyAuth string) error {
+	tlds, err := d.getTLDs()
+	if err != nil {
+		return err
+	}
+
+	ch, err := newChallenge(domain, keyAuth, tlds)
+	if err != nil {
+		return err
+	}
+
+	hosts, err := d.getHosts(ch)
+	if err != nil {
+		return err
+	}
+
+	d.addChallengeRecord(ch, &hosts)
+
+	if debug {
+		for _, h := range hosts {
+			fmt.Printf(
+				"%-5.5s %-30.30s %-6s %-70.70s\n",
+				h.Type, h.Name, h.TTL, h.Address)
+		}
+	}
+
+	return d.setHosts(ch, hosts)
+}
+
+// CleanUp removes a TXT record used for a previous DNS challenge.
+func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
+	tlds, err := d.getTLDs()
+	if err != nil {
+		return err
+	}
+
+	ch, err := newChallenge(domain, keyAuth, tlds)
+	if err != nil {
+		return err
+	}
+
+	hosts, err := d.getHosts(ch)
+	if err != nil {
+		return err
+	}
+
+	if removed := d.removeChallengeRecord(ch, &hosts); !removed {
+		return nil
+	}
+
+	return d.setHosts(ch, hosts)
+}

providers/dns/namecheap/namecheap_test.go

@@ -0,0 +1,402 @@
+package namecheap
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"testing"
+)
+
+var (
+	fakeUser     = "foo"
+	fakeKey      = "bar"
+	fakeClientIP = "10.0.0.1"
+
+	tlds = map[string]string{
+		"com.au": "com.au",
+		"com":    "com",
+		"co.uk":  "co.uk",
+		"uk":     "uk",
+		"edu":    "edu",
+		"co.com": "co.com",
+		"za.com": "za.com",
+	}
+)
+
+func assertEq(t *testing.T, variable, got, want string) {
+	if got != want {
+		t.Errorf("Expected %s to be '%s' but got '%s'", variable, want, got)
+	}
+}
+
+func assertHdr(tc *testcase, t *testing.T, values *url.Values) {
+	ch, _ := newChallenge(tc.domain, "", tlds)
+
+	assertEq(t, "ApiUser", values.Get("ApiUser"), fakeUser)
+	assertEq(t, "ApiKey", values.Get("ApiKey"), fakeKey)
+	assertEq(t, "UserName", values.Get("UserName"), fakeUser)
+	assertEq(t, "ClientIp", values.Get("ClientIp"), fakeClientIP)
+	assertEq(t, "SLD", values.Get("SLD"), ch.sld)
+	assertEq(t, "TLD", values.Get("TLD"), ch.tld)
+}
+
+func mockServer(tc *testcase, t *testing.T, w http.ResponseWriter, r *http.Request) {
+	switch r.Method {
+
+	case "GET":
+		values := r.URL.Query()
+		cmd := values.Get("Command")
+		switch cmd {
+		case "namecheap.domains.dns.getHosts":
+			assertHdr(tc, t, &values)
+			w.WriteHeader(http.StatusOK)
+			fmt.Fprintf(w, tc.getHostsResponse)
+		case "namecheap.domains.getTldList":
+			w.WriteHeader(http.StatusOK)
+			fmt.Fprintf(w, responseGetTlds)
+		default:
+			t.Errorf("Unexpected GET command: %s", cmd)
+		}
+
+	case "POST":
+		r.ParseForm()
+		values := r.Form
+		cmd := values.Get("Command")
+		switch cmd {
+		case "namecheap.domains.dns.setHosts":
+			assertHdr(tc, t, &values)
+			w.WriteHeader(http.StatusOK)
+			fmt.Fprint(w, tc.setHostsResponse)
+		default:
+			t.Errorf("Unexpected POST command: %s", cmd)
+		}
+
+	default:
+		t.Errorf("Unexpected http method: %s", r.Method)
+
+	}
+}
+
+func testGetHosts(tc *testcase, t *testing.T) {
+	mock := httptest.NewServer(http.HandlerFunc(
+		func(w http.ResponseWriter, r *http.Request) {
+			mockServer(tc, t, w, r)
+		}))
+	defer mock.Close()
+
+	prov := &DNSProvider{
+		baseURL:  mock.URL,
+		apiUser:  fakeUser,
+		apiKey:   fakeKey,
+		clientIP: fakeClientIP,
+	}
+
+	ch, _ := newChallenge(tc.domain, "", tlds)
+	hosts, err := prov.getHosts(ch)
+	if tc.errString != "" {
+		if err == nil || err.Error() != tc.errString {
+			t.Errorf("Namecheap getHosts case %s expected error", tc.name)
+		}
+	} else {
+		if err != nil {
+			t.Errorf("Namecheap getHosts case %s failed\n%v", tc.name, err)
+		}
+	}
+
+next1:
+	for _, h := range hosts {
+		for _, th := range tc.hosts {
+			if h == th {
+				continue next1
+			}
+		}
+		t.Errorf("getHosts case %s unexpected record [%s:%s:%s]",
+			tc.name, h.Type, h.Name, h.Address)
+	}
+
+next2:
+	for _, th := range tc.hosts {
+		for _, h := range hosts {
+			if h == th {
+				continue next2
+			}
+		}
+		t.Errorf("getHosts case %s missing record [%s:%s:%s]",
+			tc.name, th.Type, th.Name, th.Address)
+	}
+}
+
+func mockDNSProvider(url string) *DNSProvider {
+	return &DNSProvider{
+		baseURL:  url,
+		apiUser:  fakeUser,
+		apiKey:   fakeKey,
+		clientIP: fakeClientIP,
+	}
+}
+
+func testSetHosts(tc *testcase, t *testing.T) {
+	mock := httptest.NewServer(http.HandlerFunc(
+		func(w http.ResponseWriter, r *http.Request) {
+			mockServer(tc, t, w, r)
+		}))
+	defer mock.Close()
+
+	prov := mockDNSProvider(mock.URL)
+	ch, _ := newChallenge(tc.domain, "", tlds)
+	hosts, err := prov.getHosts(ch)
+	if tc.errString != "" {
+		if err == nil || err.Error() != tc.errString {
+			t.Errorf("Namecheap getHosts case %s expected error", tc.name)
+		}
+	} else {
+		if err != nil {
+			t.Errorf("Namecheap getHosts case %s failed\n%v", tc.name, err)
+		}
+	}
+	if err != nil {
+		return
+	}
+
+	err = prov.setHosts(ch, hosts)
+	if err != nil {
+		t.Errorf("Namecheap setHosts case %s failed", tc.name)
+	}
+}
+
+func testPresent(tc *testcase, t *testing.T) {
+	mock := httptest.NewServer(http.HandlerFunc(
+		func(w http.ResponseWriter, r *http.Request) {
+			mockServer(tc, t, w, r)
+		}))
+	defer mock.Close()
+
+	prov := mockDNSProvider(mock.URL)
+	err := prov.Present(tc.domain, "", "dummyKey")
+	if tc.errString != "" {
+		if err == nil || err.Error() != tc.errString {
+			t.Errorf("Namecheap Present case %s expected error", tc.name)
+		}
+	} else {
+		if err != nil {
+			t.Errorf("Namecheap Present case %s failed\n%v", tc.name, err)
+		}
+	}
+}
+
+func testCleanUp(tc *testcase, t *testing.T) {
+	mock := httptest.NewServer(http.HandlerFunc(
+		func(w http.ResponseWriter, r *http.Request) {
+			mockServer(tc, t, w, r)
+		}))
+	defer mock.Close()
+
+	prov := mockDNSProvider(mock.URL)
+	err := prov.CleanUp(tc.domain, "", "dummyKey")
+	if tc.errString != "" {
+		if err == nil || err.Error() != tc.errString {
+			t.Errorf("Namecheap CleanUp case %s expected error", tc.name)
+		}
+	} else {
+		if err != nil {
+			t.Errorf("Namecheap CleanUp case %s failed\n%v", tc.name, err)
+		}
+	}
+}
+
+func TestNamecheap(t *testing.T) {
+	for _, tc := range testcases {
+		testGetHosts(&tc, t)
+		testSetHosts(&tc, t)
+		testPresent(&tc, t)
+		testCleanUp(&tc, t)
+	}
+}
+
+func TestNamecheapDomainSplit(t *testing.T) {
+	tests := []struct {
+		domain string
+		valid  bool
+		tld    string
+		sld    string
+		host   string
+	}{
+		{"a.b.c.test.co.uk", true, "co.uk", "test", "a.b.c"},
+		{"test.co.uk", true, "co.uk", "test", ""},
+		{"test.com", true, "com", "test", ""},
+		{"test.co.com", true, "co.com", "test", ""},
+		{"www.test.com.au", true, "com.au", "test", "www"},
+		{"www.za.com", true, "za.com", "www", ""},
+		{"", false, "", "", ""},
+		{"a", false, "", "", ""},
+		{"com", false, "", "", ""},
+		{"co.com", false, "", "", ""},
+		{"co.uk", false, "", "", ""},
+		{"test.au", false, "", "", ""},
+		{"za.com", false, "", "", ""},
+		{"www.za", false, "", "", ""},
+		{"www.test.au", false, "", "", ""},
+		{"www.test.unk", false, "", "", ""},
+	}
+
+	for _, test := range tests {
+		valid := true
+		ch, err := newChallenge(test.domain, "", tlds)
+		if err != nil {
+			valid = false
+		}
+
+		if test.valid && !valid {
+			t.Errorf("Expected '%s' to split", test.domain)
+		} else if !test.valid && valid {
+			t.Errorf("Expected '%s' to produce error", test.domain)
+		}
+
+		if test.valid && valid {
+			assertEq(t, "domain", ch.domain, test.domain)
+			assertEq(t, "tld", ch.tld, test.tld)
+			assertEq(t, "sld", ch.sld, test.sld)
+			assertEq(t, "host", ch.host, test.host)
+		}
+	}
+}
+
+type testcase struct {
+	name             string
+	domain           string
+	hosts            []host
+	errString        string
+	getHostsResponse string
+	setHostsResponse string
+}
+
+var testcases []testcase = []testcase{
+	{
+		"Test:Success:1",
+		"test.example.com",
+		[]host{
+			{"A", "home", "10.0.0.1", "10", "1799"},
+			{"A", "www", "10.0.0.2", "10", "1200"},
+			{"AAAA", "a", "::0", "10", "1799"},
+			{"CNAME", "*", "example.com.", "10", "1799"},
+			{"MXE", "example.com", "10.0.0.5", "10", "1800"},
+			{"URL", "xyz", "https://google.com", "10", "1799"},
+		},
+		"",
+		responseGetHostsSuccess1,
+		responseSetHostsSuccess1,
+	},
+	{
+		"Test:Success:2",
+		"example.com",
+		[]host{
+			{"A", "@", "10.0.0.2", "10", "1200"},
+			{"A", "www", "10.0.0.3", "10", "60"},
+		},
+		"",
+		responseGetHostsSuccess2,
+		responseSetHostsSuccess2,
+	},
+	{
+		"Test:Error:BadApiKey:1",
+		"test.example.com",
+		nil,
+		"Namecheap error: API Key is invalid or API access has not been enabled [1011102]",
+		responseGetHostsErrorBadApiKey1,
+		"",
+	},
+}
+
+var responseGetHostsSuccess1 = `<?xml version="1.0" encoding="utf-8"?>
+<ApiResponse Status="OK" xmlns="http://api.namecheap.com/xml.response">
+  <Errors />
+  <Warnings />
+  <RequestedCommand>namecheap.domains.dns.getHosts</RequestedCommand>
+  <CommandResponse Type="namecheap.domains.dns.getHosts">
+    <DomainDNSGetHostsResult Domain="example.com" EmailType="MXE" IsUsingOurDNS="true">
+      <host HostId="217076" Name="www" Type="A" Address="10.0.0.2" MXPref="10" TTL="1200" AssociatedAppTitle="" FriendlyName="" IsActive="true" IsDDNSEnabled="false" />
+      <host HostId="217069" Name="home" Type="A" Address="10.0.0.1" MXPref="10" TTL="1799" AssociatedAppTitle="" FriendlyName="" IsActive="true" IsDDNSEnabled="false" />
+      <host HostId="217071" Name="a" Type="AAAA" Address="::0" MXPref="10" TTL="1799" AssociatedAppTitle="" FriendlyName="" IsActive="true" IsDDNSEnabled="false" />
+      <host HostId="217075" Name="*" Type="CNAME" Address="example.com." MXPref="10" TTL="1799" AssociatedAppTitle="" FriendlyName="" IsActive="true" IsDDNSEnabled="false" />
+      <host HostId="217073" Name="example.com" Type="MXE" Address="10.0.0.5" MXPref="10" TTL="1800" AssociatedAppTitle="MXE" FriendlyName="MXE1" IsActive="true" IsDDNSEnabled="false" />
+      <host HostId="217077" Name="xyz" Type="URL" Address="https://google.com" MXPref="10" TTL="1799" AssociatedAppTitle="" FriendlyName="" IsActive="true" IsDDNSEnabled="false" />
+    </DomainDNSGetHostsResult>
+  </CommandResponse>
+  <Server>PHX01SBAPI01</Server>
+  <GMTTimeDifference>--5:00</GMTTimeDifference>
+  <ExecutionTime>3.338</ExecutionTime>
+</ApiResponse>`
+
+var responseSetHostsSuccess1 = `<?xml version="1.0" encoding="utf-8"?>
+<ApiResponse Status="OK" xmlns="http://api.namecheap.com/xml.response">
+  <Errors />
+  <Warnings />
+  <RequestedCommand>namecheap.domains.dns.setHosts</RequestedCommand>
+  <CommandResponse Type="namecheap.domains.dns.setHosts">
+    <DomainDNSSetHostsResult Domain="example.com" IsSuccess="true">
+      <Warnings />
+    </DomainDNSSetHostsResult>
+  </CommandResponse>
+  <Server>PHX01SBAPI01</Server>
+  <GMTTimeDifference>--5:00</GMTTimeDifference>
+  <ExecutionTime>2.347</ExecutionTime>
+</ApiResponse>`
+
+var responseGetHostsSuccess2 = `<?xml version="1.0" encoding="utf-8"?>
+<ApiResponse Status="OK" xmlns="http://api.namecheap.com/xml.response">
+  <Errors />
+  <Warnings />
+  <RequestedCommand>namecheap.domains.dns.getHosts</RequestedCommand>
+  <CommandResponse Type="namecheap.domains.dns.getHosts">
+    <DomainDNSGetHostsResult Domain="example.com" EmailType="MXE" IsUsingOurDNS="true">
+      <host HostId="217076" Name="@" Type="A" Address="10.0.0.2" MXPref="10" TTL="1200" AssociatedAppTitle="" FriendlyName="" IsActive="true" IsDDNSEnabled="false" />
+      <host HostId="217069" Name="www" Type="A" Address="10.0.0.3" MXPref="10" TTL="60" AssociatedAppTitle="" FriendlyName="" IsActive="true" IsDDNSEnabled="false" />
+    </DomainDNSGetHostsResult>
+  </CommandResponse>
+  <Server>PHX01SBAPI01</Server>
+  <GMTTimeDifference>--5:00</GMTTimeDifference>
+  <ExecutionTime>3.338</ExecutionTime>
+</ApiResponse>`
+
+var responseSetHostsSuccess2 = `<?xml version="1.0" encoding="utf-8"?>
+<ApiResponse Status="OK" xmlns="http://api.namecheap.com/xml.response">
+  <Errors />
+  <Warnings />
+  <RequestedCommand>namecheap.domains.dns.setHosts</RequestedCommand>
+  <CommandResponse Type="namecheap.domains.dns.setHosts">
+    <DomainDNSSetHostsResult Domain="example.com" IsSuccess="true">
+      <Warnings />
+    </DomainDNSSetHostsResult>
+  </CommandResponse>
+  <Server>PHX01SBAPI01</Server>
+  <GMTTimeDifference>--5:00</GMTTimeDifference>
+  <ExecutionTime>2.347</ExecutionTime>
+</ApiResponse>`
+
+var responseGetHostsErrorBadApiKey1 = `<?xml version="1.0" encoding="utf-8"?>
+<ApiResponse Status="ERROR" xmlns="http://api.namecheap.com/xml.response">
+  <Errors>
+    <Error Number="1011102">API Key is invalid or API access has not been enabled</Error>
+  </Errors>
+  <Warnings />
+  <RequestedCommand />
+  <Server>PHX01SBAPI01</Server>
+  <GMTTimeDifference>--5:00</GMTTimeDifference>
+  <ExecutionTime>0</ExecutionTime>
+</ApiResponse>`
+
+var responseGetTlds = `<?xml version="1.0" encoding="utf-8"?>
+<ApiResponse Status="OK" xmlns="http://api.namecheap.com/xml.response">
+  <Errors />
+  <Warnings />
+  <RequestedCommand>namecheap.domains.getTldList</RequestedCommand>
+  <CommandResponse Type="namecheap.domains.getTldList">
+    <Tlds>
+      <Tld Name="com" NonRealTime="false" MinRegisterYears="1" MaxRegisterYears="10" MinRenewYears="1" MaxRenewYears="10" RenewalMinDays="0" RenewalMaxDays="4000" ReactivateMaxDays="27" MinTransferYears="1" MaxTransferYears="1" IsApiRegisterable="true" IsApiRenewable="true" IsApiTransferable="true" IsEppRequired="true" IsDisableModContact="false" IsDisableWGAllot="false" IsIncludeInExtendedSearchOnly="false" SequenceNumber="10" Type="GTLD" SubType="" IsSupportsIDN="true" Category="A" SupportsRegistrarLock="true" AddGracePeriodDays="5" WhoisVerification="false" ProviderApiDelete="true" TldState="" SearchGroup="" Registry="">Most recognized top level domain<Categories><TldCategory Name="popular" SequenceNumber="10" /></Categories></Tld>
+    </Tlds>
+  </CommandResponse>
+  <Server>PHX01SBAPI01</Server>
+  <GMTTimeDifference>--5:00</GMTTimeDifference>
+  <ExecutionTime>0.004</ExecutionTime>
+</ApiResponse>`