feat(wpscan): support enterprise feature

[future-ryunosuketanai]

What did you implement:

There are two versions of wpscan:
・Free researcher version
・Paid enterprise version

This PR have accommodated the values obtained in the enterprise version.
And changed the structure that is only used for unmarshal of json in wpscan to unexported.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

I ran make test in the local environment.
And I have also confirmed the passing of the following tests added this time.

$ go test -v -run Test_convertToVinfos
=== RUN   Test_convertToVinfos
=== RUN   Test_convertToVinfos/WordPress_vulnerabilities_Enterprise
=== RUN   Test_convertToVinfos/WordPress_vulnerabilities_Researcher
--- PASS: Test_convertToVinfos (0.00s)
    --- PASS: Test_convertToVinfos/WordPress_vulnerabilities_Enterprise (0.00s)
    --- PASS: Test_convertToVinfos/WordPress_vulnerabilities_Researcher (0.00s)
PASS
ok      github.com/future-architect/vuls/detector       0.016s

Checklist:

You don't have to satisfy all of the following.

• Write tests
• Write documentation
• Check that there aren't other open pull requests for the same issue/feature
• Format your source code by make fmt
• Pass the test by make test
• Provide verification config / commands
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: Yes

Reference

• Enterprise Features
  • https://wpscan.com/enterprise-customers-features/
  • https://wpscan.com/blog/new-description-and-poc-fields-in-api/
• WPScan WordPress Vulnerability Database API
  • https://wpscan.com/docs/api/v3/v3.yml/
  • https://wpscan.com/docs/api/v3/

[future-ryunosuketanai]

@MaineK00n @shino
Thank you for your thoughtful comments and suggestions.
I have made the corrections, so please review the PR.

[MaineK00n]

I don't think it's necessary to export WpCveInfos, WpCveInfo, and References, what do you think?
I think unnecessary exports create unnecessary guarantees for backward compatibility.

:100644 100644 09f7c7e 0000000 M	detector/wordpress.go

diff --git a/detector/wordpress.go b/detector/wordpress.go
index 09f7c7e..4086b63 100644
--- a/detector/wordpress.go
+++ b/detector/wordpress.go
@@ -22,20 +22,20 @@ import (
 	"golang.org/x/xerrors"
 )
 
-// WpCveInfos is for wpscan json
-type WpCveInfos struct {
+// wpCveInfos is for wpscan json
+type wpCveInfos struct {
 	ReleaseDate  string `json:"release_date"`
 	ChangelogURL string `json:"changelog_url"`
 	// Status        string `json:"status"`
 	LatestVersion string `json:"latest_version"`
 	LastUpdated   string `json:"last_updated"`
 	// Popular         bool        `json:"popular"`
-	Vulnerabilities []WpCveInfo `json:"vulnerabilities"`
+	Vulnerabilities []wpCveInfo `json:"vulnerabilities"`
 	Error           string      `json:"error"`
 }
 
-// WpCveInfo is for wpscan json
-type WpCveInfo struct {
+// wpCveInfo is for wpscan json
+type wpCveInfo struct {
 	ID            string     `json:"id"`
 	Title         string     `json:"title"`
 	CreatedAt     time.Time  `json:"created_at"`
@@ -44,7 +44,7 @@ type WpCveInfo struct {
 	Description   *string    `json:"description"` // Enterprise only
 	Poc           *string    `json:"poc"`         // Enterprise only
 	VulnType      string     `json:"vuln_type"`
-	References    References `json:"references"`
+	References    references `json:"references"`
 	Cvss          *Cvss      `json:"cvss"` // Enterprise only
 	Verified      bool       `json:"verified"`
 	FixedIn       *string    `json:"fixed_in"`
@@ -52,8 +52,8 @@ type WpCveInfo struct {
 	Closed        *Closed    `json:"closed"`
 }
 
-// References is for wpscan json
-type References struct {
+// references is for wpscan json
+type references struct {
 	URL     []string `json:"url"`
 	Cve     []string `json:"cve"`
 	YouTube []string `json:"youtube,omitempty"`

[future-ryunosuketanai]

@MaineK00n @shino
Based on your comments, I have made two corrections. Please check them.
・Added exploitdb
・Changed some structures to unexported.

[shino]

Great contribution! Thanks a lot!!