provider,resource_smtp_credential: Support configuring SMTP credentials

- https://improvmx.com/api/#smtp-list

README.md

@@ -12,14 +12,15 @@ A very nascent Terraform provider for configuring [ImprovMX](https://improvmx.co
 - Delete an email forward.
 - Import an email forward.
 - Update an email forward (ImprovMX allows updating an email forward to send to more than one address, ie `alice@example.com,bob@example.com`).
+- Create, update and delete a domain's SMTP credentials.
 
 ## Usage
 
 ```hcl
 terraform {
   required_providers {
     improvmx = {
-      source  = "issyl0/improvmx"
+      source = "issyl0/improvmx"
     }
   }
 }

docs/resources/improvmx_smtp_credential.md

@@ -0,0 +1,19 @@
+# `improvmx_smtp_credential` Resource
+
+A resource to create ImprovMX domain SMTP credentials.
+
+## Example Usage
+
+```hcl
+resource "improvmx_email_forward" "example" {
+  domain   = "example.com"
+  username = "example"
+  password = var.password
+}
+```
+
+## Argument Reference
+
+* `domain` - (Required) Name of the domain.
+* `username` - (Required) Username of the SMTP sender.
+* `password` - (Required) Password for the SMTP sending account.

improvmx/provider.go

@@ -15,8 +15,12 @@ type Meta struct {
 
 func Provider() *schema.Provider {
 	p := &schema.Provider{
-		Schema:             map[string]*schema.Schema{"token": {Type: schema.TypeString, Required: true, DefaultFunc: schema.EnvDefaultFunc("IMPROVMX_API_TOKEN", nil), Description: "The API token for API operations."}},
-		ResourcesMap:       map[string]*schema.Resource{"improvmx_domain": resourceDomain(), "improvmx_email_forward": resourceEmailForward()},
+		Schema: map[string]*schema.Schema{"token": {Type: schema.TypeString, Required: true, DefaultFunc: schema.EnvDefaultFunc("IMPROVMX_API_TOKEN", nil), Description: "The API token for API operations."}},
+		ResourcesMap: map[string]*schema.Resource{
+			"improvmx_domain":          resourceDomain(),
+			"improvmx_email_forward":   resourceEmailForward(),
+			"improvmx_smtp_credential": resourceSMTPCredential(),
+		},
 		DataSourcesMap:     map[string]*schema.Resource{},
 		ProviderMetaSchema: map[string]*schema.Schema{},
 	}

improvmx/resource_smtp_credential.go

@@ -0,0 +1,120 @@
+package improvmx
+
+import (
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
+)
+
+func resourceSMTPCredential() *schema.Resource {
+	return &schema.Resource{
+		Create: resourceSMTPCredentialCreate,
+		Read:   resourceSMTPCredentialRead,
+		Update: resourceSMTPCredentialUpdate,
+		Delete: resourceSMTPCredentialDelete,
+
+		Schema: map[string]*schema.Schema{
+			"domain": {
+				Type:     schema.TypeString,
+				Required: true,
+			},
+			"username": {
+				Type:     schema.TypeString,
+				Required: true,
+			},
+			"password": {
+				Type:      schema.TypeString,
+				Required:  true,
+				Sensitive: true,
+			},
+		},
+	}
+}
+
+func resourceSMTPCredentialCreate(d *schema.ResourceData, meta interface{}) error {
+	m := meta.(*Meta)
+
+	for {
+		resp := m.Client.CreateSMTPCredential(d.Get("domain").(string), d.Get("username").(string), d.Get("password").(string))
+
+		log.Printf("[DEBUG] Got status code %v from ImprovMX API on Create for SMTP %s@%s, success: %v, errors: %v.", resp.Code, d.Get("username").(string), d.Get("domain").(string), resp.Success, resp.Errors)
+
+		if resp.Code == 429 {
+			log.Printf("[DEBUG] Sleeping for 10 seconds to allow rate limit to recover.")
+			time.Sleep(10 * time.Second)
+		}
+
+		if resp.Code == 404 {
+			log.Printf("[DEBUG] Couldn't find the resource in ImprovMX. Aborting")
+			return fmt.Errorf("HTTP response code %d, error text: %s", resp.Code, resp.Errors.Domain)
+		}
+
+		if resp.Success {
+			return resourceSMTPCredentialRead(d, meta)
+		}
+	}
+}
+
+func resourceSMTPCredentialRead(d *schema.ResourceData, meta interface{}) error {
+	m := meta.(*Meta)
+	m.Mutex.Lock()
+	defer m.Mutex.Unlock()
+
+	for {
+		resp := m.Client.GetSMTPCredential(d.Get("domain").(string))
+
+		log.Printf("[DEBUG] Got status code %v from ImprovMX API on Read for SMTP domain %s, success: %v, errors: %v.", resp.Code, d.Get("domain").(string), resp.Success, resp.Errors)
+
+		if resp.Code == 429 {
+			log.Printf("[DEBUG] Sleeping for 10 seconds to allow rate limit to recover.")
+			time.Sleep(10 * time.Second)
+		}
+
+		if resp.Code == 404 {
+			log.Printf("[DEBUG] Couldn't find the resource in ImprovMX. Aborting")
+			return fmt.Errorf("HTTP response code %d, error text: %s", resp.Code, resp.Errors.Domain)
+		}
+
+		if resp.Success {
+			d.SetId(d.Get("domain").(string))
+			d.Set("domain", d.Get("domain").(string))
+			return nil
+		}
+	}
+}
+
+func resourceSMTPCredentialUpdate(d *schema.ResourceData, meta interface{}) error {
+	m := meta.(*Meta)
+
+	for {
+		resp := m.Client.UpdateSMTPCredential(d.Get("domain").(string), d.Get("username").(string), d.Get("password").(string))
+
+		log.Printf("[DEBUG] Got status code %v from ImprovMX API on Update for SMTP domain %s@%s, success: %v, errors: %v.", resp.Code, d.Get("username").(string), d.Get("domain").(string), resp.Success, resp.Errors)
+
+		if resp.Code == 429 {
+			log.Printf("[DEBUG] Sleeping for 10 seconds to allow rate limit to recover.")
+			time.Sleep(10 * time.Second)
+		}
+
+		if resp.Code == 404 {
+			log.Printf("[DEBUG] Couldn't find the resource in ImprovMX. Aborting")
+			return fmt.Errorf("HTTP response code %d, error text: %s", resp.Code, resp.Errors.Domain)
+		}
+
+		if resp.Success {
+			return resourceSMTPCredentialRead(d, meta)
+		}
+	}
+}
+
+func resourceSMTPCredentialDelete(d *schema.ResourceData, meta interface{}) error {
+	m := meta.(*Meta)
+	m.Mutex.Lock()
+	defer m.Mutex.Unlock()
+
+	m.Client.DeleteSMTPCredential(d.Get("domain").(string), d.Get("username").(string))
+
+	return nil
+}