feat(schema): Improve SAM Global support (#376)

BREAKING CHANGE: Improved implementation of Globals (in SAM tempates)

This PR introduces a new implementation for both defining SAM templates with `Global` values, as well as parsing templates containing them.

Note: Globals only apply to SAM templates - if you are using regular CloudFormation templates this breaking change should not impact you. The only impact you might see is if you are creating `cloudFormation.Template` structs manually rather than using the `cloudformation.NewTemplate()` constructor. As part of this change, a new field (`Globals`) was added to the `Template{}` struct. If you are not using the constructor, your compiler will probably complain that this field is missing from the struct instantiation in your code.    

For more information about what `Globals` are in SAM templates, see this link:
https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-specification-template-anatomy-globals.html

In previous versions of Goformation (before v5), goformation was able to parse SAM templates that contained a `Globals` section, however the implementation just overwrote the resource properties in the template, with the global values at parse time.

This meant that:

 - It was not possible to compose a template in Go that had a Globals section.
 - The JSON Schema generated by this repo, had no concept of Globals.

 **This new implementation DOES NOT does not overwrite the values in the template, like the previous implementation did**. It replaces the old implementation completely, and exposes Globals as a series of structs that are marshalled/unmarshalled to/from JSON/YAML.

 This allows you to compose a template:

```go
template := cloudformation.NewTemplate()

template.Globals["Function"] = &global.Function{
    Timeout: 1800,
}
```

As well as parse a JSON/YAML template, and inspect the global properties:

```go
template, err := goformation.Open("../some-template-with-globals.yml")
if err != nil {
    fmt.Printf("failed to open template: %s\n", err)
    os.Exit(1)
} 

fmt.Printf("%v", template.Globals["Function"])

// You can view the global as above, however it's type is downcast to a basic interface.
// If you want to inspect properties specific to the global type (e.g. the timeout for a Lambda function)
// then use the following helper methods to get the various global types from the template:

globalAPI, _:= template.GetServerlessGlobalApi()
globalFunction, _ := template.GetServerlessGlobalFunction()
globalHttpApi, _ := template.GetServerlessGlobalHttpApi()
globalSimpleTable, _ := template.GetServerlessGlobalSimpleTable()

fmt.Printf("Global Function Timeout: %d\n", globalFunction.Timeout)
```

*Issue #, if available:* Fixes issues #199 and #305

README.md

@@ -29,7 +29,7 @@
 As with other Go libraries, GoFormation can be installed with `go get`.
 
 ```
-$ go get github.com/awslabs/goformation/v4
+$ go get github.com/awslabs/goformation/v5
 ```
 
 ## Usage
@@ -46,8 +46,8 @@ import (
 	"strconv"
 	"time"
 
-	"github.com/awslabs/goformation/v4/cloudformation"
-	"github.com/awslabs/goformation/v4/cloudformation/sns"
+	"github.com/awslabs/goformation/v5/cloudformation"
+	"github.com/awslabs/goformation/v5/cloudformation/sns"
 
 
 )
@@ -161,7 +161,7 @@ package main
 import (
 	"log"
 
-	"github.com/awslabs/goformation/v4"
+	"github.com/awslabs/goformation/v5"
 )
 
 func main() {

cloudformation/accessanalyzer/aws-accessanalyzer-analyzer.go

@@ -5,8 +5,8 @@ import (
 	"encoding/json"
 	"fmt"
 
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
-	"github.com/awslabs/goformation/v4/cloudformation/tags"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/tags"
 )
 
 // Analyzer AWS CloudFormation Resource (AWS::AccessAnalyzer::Analyzer)

cloudformation/accessanalyzer/aws-accessanalyzer-analyzer_archiverule.go

@@ -1,7 +1,7 @@
 package accessanalyzer
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Analyzer_ArchiveRule AWS CloudFormation Resource (AWS::AccessAnalyzer::Analyzer.ArchiveRule)

cloudformation/accessanalyzer/aws-accessanalyzer-analyzer_filter.go

@@ -1,7 +1,7 @@
 package accessanalyzer
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Analyzer_Filter AWS CloudFormation Resource (AWS::AccessAnalyzer::Analyzer.Filter)

cloudformation/acmpca/aws-acmpca-certificate.go

@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Certificate AWS CloudFormation Resource (AWS::ACMPCA::Certificate)

cloudformation/acmpca/aws-acmpca-certificate_apipassthrough.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Certificate_ApiPassthrough AWS CloudFormation Resource (AWS::ACMPCA::Certificate.ApiPassthrough)

cloudformation/acmpca/aws-acmpca-certificate_certificatepolicylist.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Certificate_CertificatePolicyList AWS CloudFormation Resource (AWS::ACMPCA::Certificate.CertificatePolicyList)

cloudformation/acmpca/aws-acmpca-certificate_edipartyname.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Certificate_EdiPartyName AWS CloudFormation Resource (AWS::ACMPCA::Certificate.EdiPartyName)

cloudformation/acmpca/aws-acmpca-certificate_extendedkeyusage.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Certificate_ExtendedKeyUsage AWS CloudFormation Resource (AWS::ACMPCA::Certificate.ExtendedKeyUsage)

cloudformation/acmpca/aws-acmpca-certificate_extendedkeyusagelist.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Certificate_ExtendedKeyUsageList AWS CloudFormation Resource (AWS::ACMPCA::Certificate.ExtendedKeyUsageList)

cloudformation/acmpca/aws-acmpca-certificate_extensions.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Certificate_Extensions AWS CloudFormation Resource (AWS::ACMPCA::Certificate.Extensions)

cloudformation/acmpca/aws-acmpca-certificate_generalname.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Certificate_GeneralName AWS CloudFormation Resource (AWS::ACMPCA::Certificate.GeneralName)

cloudformation/acmpca/aws-acmpca-certificate_generalnamelist.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Certificate_GeneralNameList AWS CloudFormation Resource (AWS::ACMPCA::Certificate.GeneralNameList)

cloudformation/acmpca/aws-acmpca-certificate_keyusage.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Certificate_KeyUsage AWS CloudFormation Resource (AWS::ACMPCA::Certificate.KeyUsage)

cloudformation/acmpca/aws-acmpca-certificate_othername.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Certificate_OtherName AWS CloudFormation Resource (AWS::ACMPCA::Certificate.OtherName)

cloudformation/acmpca/aws-acmpca-certificate_policyinformation.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Certificate_PolicyInformation AWS CloudFormation Resource (AWS::ACMPCA::Certificate.PolicyInformation)

cloudformation/acmpca/aws-acmpca-certificate_policyqualifierinfo.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Certificate_PolicyQualifierInfo AWS CloudFormation Resource (AWS::ACMPCA::Certificate.PolicyQualifierInfo)

cloudformation/acmpca/aws-acmpca-certificate_policyqualifierinfolist.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Certificate_PolicyQualifierInfoList AWS CloudFormation Resource (AWS::ACMPCA::Certificate.PolicyQualifierInfoList)

cloudformation/acmpca/aws-acmpca-certificate_qualifier.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Certificate_Qualifier AWS CloudFormation Resource (AWS::ACMPCA::Certificate.Qualifier)

cloudformation/acmpca/aws-acmpca-certificate_subject.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Certificate_Subject AWS CloudFormation Resource (AWS::ACMPCA::Certificate.Subject)

cloudformation/acmpca/aws-acmpca-certificate_validity.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // Certificate_Validity AWS CloudFormation Resource (AWS::ACMPCA::Certificate.Validity)

cloudformation/acmpca/aws-acmpca-certificateauthority.go

@@ -5,8 +5,8 @@ import (
 	"encoding/json"
 	"fmt"
 
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
-	"github.com/awslabs/goformation/v4/cloudformation/tags"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/tags"
 )
 
 // CertificateAuthority AWS CloudFormation Resource (AWS::ACMPCA::CertificateAuthority)

cloudformation/acmpca/aws-acmpca-certificateauthority_accessdescription.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // CertificateAuthority_AccessDescription AWS CloudFormation Resource (AWS::ACMPCA::CertificateAuthority.AccessDescription)

cloudformation/acmpca/aws-acmpca-certificateauthority_accessmethod.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // CertificateAuthority_AccessMethod AWS CloudFormation Resource (AWS::ACMPCA::CertificateAuthority.AccessMethod)

cloudformation/acmpca/aws-acmpca-certificateauthority_crlconfiguration.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // CertificateAuthority_CrlConfiguration AWS CloudFormation Resource (AWS::ACMPCA::CertificateAuthority.CrlConfiguration)

cloudformation/acmpca/aws-acmpca-certificateauthority_csrextensions.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // CertificateAuthority_CsrExtensions AWS CloudFormation Resource (AWS::ACMPCA::CertificateAuthority.CsrExtensions)

cloudformation/acmpca/aws-acmpca-certificateauthority_edipartyname.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // CertificateAuthority_EdiPartyName AWS CloudFormation Resource (AWS::ACMPCA::CertificateAuthority.EdiPartyName)

cloudformation/acmpca/aws-acmpca-certificateauthority_generalname.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // CertificateAuthority_GeneralName AWS CloudFormation Resource (AWS::ACMPCA::CertificateAuthority.GeneralName)

cloudformation/acmpca/aws-acmpca-certificateauthority_keyusage.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // CertificateAuthority_KeyUsage AWS CloudFormation Resource (AWS::ACMPCA::CertificateAuthority.KeyUsage)

cloudformation/acmpca/aws-acmpca-certificateauthority_othername.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // CertificateAuthority_OtherName AWS CloudFormation Resource (AWS::ACMPCA::CertificateAuthority.OtherName)

cloudformation/acmpca/aws-acmpca-certificateauthority_revocationconfiguration.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // CertificateAuthority_RevocationConfiguration AWS CloudFormation Resource (AWS::ACMPCA::CertificateAuthority.RevocationConfiguration)

cloudformation/acmpca/aws-acmpca-certificateauthority_subject.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // CertificateAuthority_Subject AWS CloudFormation Resource (AWS::ACMPCA::CertificateAuthority.Subject)

cloudformation/acmpca/aws-acmpca-certificateauthority_subjectinformationaccess.go

@@ -1,7 +1,7 @@
 package acmpca
 
 import (
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // CertificateAuthority_SubjectInformationAccess AWS CloudFormation Resource (AWS::ACMPCA::CertificateAuthority.SubjectInformationAccess)

cloudformation/acmpca/aws-acmpca-certificateauthorityactivation.go

@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 
-	"github.com/awslabs/goformation/v4/cloudformation/policies"
+	"github.com/awslabs/goformation/v5/cloudformation/policies"
 )
 
 // CertificateAuthorityActivation AWS CloudFormation Resource (AWS::ACMPCA::CertificateAuthorityActivation)