github.com/meteor/terraform@v0.6.15-0.20210412225145-79ec4bc057c6/builtin/providers/aws/resource_aws_waf_rule.go (about)

     1  package aws
     2  
     3  import (
     4  	"fmt"
     5  	"log"
     6  
     7  	"github.com/aws/aws-sdk-go/aws"
     8  	"github.com/aws/aws-sdk-go/aws/awserr"
     9  	"github.com/aws/aws-sdk-go/service/waf"
    10  	"github.com/hashicorp/terraform/helper/schema"
    11  )
    12  
    13  func resourceAwsWafRule() *schema.Resource {
    14  	return &schema.Resource{
    15  		Create: resourceAwsWafRuleCreate,
    16  		Read:   resourceAwsWafRuleRead,
    17  		Update: resourceAwsWafRuleUpdate,
    18  		Delete: resourceAwsWafRuleDelete,
    19  
    20  		Schema: map[string]*schema.Schema{
    21  			"name": &schema.Schema{
    22  				Type:     schema.TypeString,
    23  				Required: true,
    24  				ForceNew: true,
    25  			},
    26  			"metric_name": &schema.Schema{
    27  				Type:         schema.TypeString,
    28  				Required:     true,
    29  				ForceNew:     true,
    30  				ValidateFunc: validateWafMetricName,
    31  			},
    32  			"predicates": &schema.Schema{
    33  				Type:     schema.TypeSet,
    34  				Optional: true,
    35  				Elem: &schema.Resource{
    36  					Schema: map[string]*schema.Schema{
    37  						"negated": &schema.Schema{
    38  							Type:     schema.TypeBool,
    39  							Required: true,
    40  						},
    41  						"data_id": &schema.Schema{
    42  							Type:     schema.TypeString,
    43  							Optional: true,
    44  							ValidateFunc: func(v interface{}, k string) (ws []string, errors []error) {
    45  								value := v.(string)
    46  								if len(value) > 128 {
    47  									errors = append(errors, fmt.Errorf(
    48  										"%q cannot be longer than 128 characters", k))
    49  								}
    50  								return
    51  							},
    52  						},
    53  						"type": &schema.Schema{
    54  							Type:     schema.TypeString,
    55  							Required: true,
    56  							ValidateFunc: func(v interface{}, k string) (ws []string, errors []error) {
    57  								value := v.(string)
    58  								if value != "IPMatch" && value != "ByteMatch" && value != "SqlInjectionMatch" && value != "SizeConstraint" && value != "XssMatch" {
    59  									errors = append(errors, fmt.Errorf(
    60  										"%q must be one of IPMatch | ByteMatch | SqlInjectionMatch | SizeConstraint | XssMatch", k))
    61  								}
    62  								return
    63  							},
    64  						},
    65  					},
    66  				},
    67  			},
    68  		},
    69  	}
    70  }
    71  
    72  func resourceAwsWafRuleCreate(d *schema.ResourceData, meta interface{}) error {
    73  	conn := meta.(*AWSClient).wafconn
    74  
    75  	wr := newWafRetryer(conn, "global")
    76  	out, err := wr.RetryWithToken(func(token *string) (interface{}, error) {
    77  		params := &waf.CreateRuleInput{
    78  			ChangeToken: token,
    79  			MetricName:  aws.String(d.Get("metric_name").(string)),
    80  			Name:        aws.String(d.Get("name").(string)),
    81  		}
    82  
    83  		return conn.CreateRule(params)
    84  	})
    85  	if err != nil {
    86  		return err
    87  	}
    88  	resp := out.(*waf.CreateRuleOutput)
    89  	d.SetId(*resp.Rule.RuleId)
    90  	return resourceAwsWafRuleUpdate(d, meta)
    91  }
    92  
    93  func resourceAwsWafRuleRead(d *schema.ResourceData, meta interface{}) error {
    94  	conn := meta.(*AWSClient).wafconn
    95  
    96  	params := &waf.GetRuleInput{
    97  		RuleId: aws.String(d.Id()),
    98  	}
    99  
   100  	resp, err := conn.GetRule(params)
   101  	if err != nil {
   102  		if awsErr, ok := err.(awserr.Error); ok && awsErr.Code() == "WAFNonexistentItemException" {
   103  			log.Printf("[WARN] WAF Rule (%s) not found, error code (404)", d.Id())
   104  			d.SetId("")
   105  			return nil
   106  		}
   107  
   108  		return err
   109  	}
   110  
   111  	var predicates []map[string]interface{}
   112  
   113  	for _, predicateSet := range resp.Rule.Predicates {
   114  		predicate := map[string]interface{}{
   115  			"negated": *predicateSet.Negated,
   116  			"type":    *predicateSet.Type,
   117  			"data_id": *predicateSet.DataId,
   118  		}
   119  		predicates = append(predicates, predicate)
   120  	}
   121  
   122  	d.Set("predicates", predicates)
   123  	d.Set("name", resp.Rule.Name)
   124  	d.Set("metric_name", resp.Rule.MetricName)
   125  
   126  	return nil
   127  }
   128  
   129  func resourceAwsWafRuleUpdate(d *schema.ResourceData, meta interface{}) error {
   130  	conn := meta.(*AWSClient).wafconn
   131  
   132  	if d.HasChange("predicates") {
   133  		o, n := d.GetChange("predicates")
   134  		oldP, newP := o.(*schema.Set).List(), n.(*schema.Set).List()
   135  
   136  		err := updateWafRuleResource(d.Id(), oldP, newP, conn)
   137  		if err != nil {
   138  			return fmt.Errorf("Error Updating WAF Rule: %s", err)
   139  		}
   140  	}
   141  
   142  	return resourceAwsWafRuleRead(d, meta)
   143  }
   144  
   145  func resourceAwsWafRuleDelete(d *schema.ResourceData, meta interface{}) error {
   146  	conn := meta.(*AWSClient).wafconn
   147  
   148  	oldPredicates := d.Get("predicates").(*schema.Set).List()
   149  	if len(oldPredicates) > 0 {
   150  		noPredicates := []interface{}{}
   151  		err := updateWafRuleResource(d.Id(), oldPredicates, noPredicates, conn)
   152  		if err != nil {
   153  			return fmt.Errorf("Error updating WAF Rule Predicates: %s", err)
   154  		}
   155  	}
   156  
   157  	wr := newWafRetryer(conn, "global")
   158  	_, err := wr.RetryWithToken(func(token *string) (interface{}, error) {
   159  		req := &waf.DeleteRuleInput{
   160  			ChangeToken: token,
   161  			RuleId:      aws.String(d.Id()),
   162  		}
   163  		log.Printf("[INFO] Deleting WAF Rule")
   164  		return conn.DeleteRule(req)
   165  	})
   166  	if err != nil {
   167  		return fmt.Errorf("Error deleting WAF Rule: %s", err)
   168  	}
   169  
   170  	return nil
   171  }
   172  
   173  func updateWafRuleResource(id string, oldP, newP []interface{}, conn *waf.WAF) error {
   174  	wr := newWafRetryer(conn, "global")
   175  	_, err := wr.RetryWithToken(func(token *string) (interface{}, error) {
   176  		req := &waf.UpdateRuleInput{
   177  			ChangeToken: token,
   178  			RuleId:      aws.String(id),
   179  			Updates:     diffWafRulePredicates(oldP, newP),
   180  		}
   181  
   182  		return conn.UpdateRule(req)
   183  	})
   184  	if err != nil {
   185  		return fmt.Errorf("Error Updating WAF Rule: %s", err)
   186  	}
   187  
   188  	return nil
   189  }
   190  
   191  func diffWafRulePredicates(oldP, newP []interface{}) []*waf.RuleUpdate {
   192  	updates := make([]*waf.RuleUpdate, 0)
   193  
   194  	for _, op := range oldP {
   195  		predicate := op.(map[string]interface{})
   196  
   197  		if idx, contains := sliceContainsMap(newP, predicate); contains {
   198  			newP = append(newP[:idx], newP[idx+1:]...)
   199  			continue
   200  		}
   201  
   202  		updates = append(updates, &waf.RuleUpdate{
   203  			Action: aws.String(waf.ChangeActionDelete),
   204  			Predicate: &waf.Predicate{
   205  				Negated: aws.Bool(predicate["negated"].(bool)),
   206  				Type:    aws.String(predicate["type"].(string)),
   207  				DataId:  aws.String(predicate["data_id"].(string)),
   208  			},
   209  		})
   210  	}
   211  
   212  	for _, np := range newP {
   213  		predicate := np.(map[string]interface{})
   214  
   215  		updates = append(updates, &waf.RuleUpdate{
   216  			Action: aws.String(waf.ChangeActionInsert),
   217  			Predicate: &waf.Predicate{
   218  				Negated: aws.Bool(predicate["negated"].(bool)),
   219  				Type:    aws.String(predicate["type"].(string)),
   220  				DataId:  aws.String(predicate["data_id"].(string)),
   221  			},
   222  		})
   223  	}
   224  	return updates
   225  }