SirDataFR / iabtcfv2

Go client to read TCF v2 consent string

iab-tcf-v2

Go client library to read and encode IAB TCF v2.0 TC Strings.

Installation

go get github.com/SirDataFR/iabtcfv2

The package defines a TCData structure with the three segments a TC String can contain:

• CoreString
• DisclosedVendors
• PublisherTC

Decode a TC String

To decode a TC String, use Decode(tcString string) (t *TCData, err error).

NOTE : A valid TC String must start with a Core String segment value.

var tcData, err = iabtcfv2.Decode("COxR03kOxR1CqBcABCENAgCMAP_AAH_AAAqIF3EXySoGY2thI2YVFxBEIYwfJxyigMgChgQIsSwNQIeFLBoGLiAAHBGYJAQAGBAEEACBAQIkHGBMCQAAgAgBiRCMQEGMCzNIBIBAggEbY0FACCVmHkHSmZCY7064O__QLuIJEFQMAkSBAIACLECIQwAQDiAAAYAlAAABAhIaAAgIWBQEeAAAACAwAAgAAABBAAACAAQAAICIAAABAAAgAiAQAAAAGgIQAACBABACRIAAAEANCAAgiCEAQg4EAo4AAA.IF3EXySoGY2tho2YVFzBEIYwfJxyigMgShgQIsS0NQIeFLBoGPiAAHBGYJAQAGBAkkACBAQIsHGBMCQABgAgRiRCMQEGMDzNIBIBAggkbY0FACCVmnkHS3ZCY70-6u__QA.elAAAAAAAWA")
if err != nil {
  fmt.Printf("%v", err)
}

To decode a segment value of a TC String, use the appropriate function:

• DecodeCoreString(coreString string) (c *CoreString, err error)
• DecodeDisclosedVendors(disclosedVendors string) (d *DisclosedVendors, err error)
• DecodePublisherTC(publisherTC string) (p *PublisherTC, err error)

var coreString, err = iabtcfv2.DecodeCoreString("COxR03kOxR1CqBcABCENAgCMAP_AAH_AAAqIF3EXySoGY2thI2YVFxBEIYwfJxyigMgChgQIsSwNQIeFLBoGLiAAHBGYJAQAGBAEEACBAQIkHGBMCQAAgAgBiRCMQEGMCzNIBIBAggEbY0FACCVmHkHSmZCY7064O__QLuIJEFQMAkSBAIACLECIQwAQDiAAAYAlAAABAhIaAAgIWBQEeAAAACAwAAgAAABBAAACAAQAAICIAAABAAAgAiAQAAAAGgIQAACBABACRIAAAEANCAAgiCEAQg4EAo4AAA")
if err != nil {
  fmt.Printf("%v", err)
}

Use GetSegmentType(segment string) (segmentType SegmentType, err error) to read the segment type from a segment value:

• SegmentTypeUndefined = undefined
• SegmentTypeCoreString = Core String
• SegmentTypeDisclosedVendors = Disclosed Vendors
• SegmentTypePublisherTC = Publisher TC

You can find more information about segment types here.

Use GetVersion(s string) (version TcfVersion, err error) to read the cookie version from a TC String or a Core String segment value. This function also supports TCF v1.1 consent strings:

• TcfVersionUndefined = undefined
• TcfVersion1 = TCF v1.1
• TcfVersion2 = TCF v2.0

Example

package main

import (
  "fmt"
  "github.com/SirDataFR/iabtcfv2"
)

func main() {
  tcString := "COxSKBCOxSKCCBcABCENAgCMAPzAAEPAAAqIDaQBQAMgAgABqAR0A2gDaQAwAMgAgANoAAA"
  
  version, err := iabtcfv2.GetVersion(tcString)
  if err != nil {
    fmt.Printf("%v", err)
  }
  
  segmentType, err := iabtcfv2.GetSegmentType(tcString)
  if err != nil {
    fmt.Printf("%v", err)
  }
  
  var tcData, err = iabtcfv2.Decode(tcString)
  if err != nil {
    fmt.Printf("%v", err)
  }
  
  fmt.Printf("%+v\n", version)
  fmt.Printf("%+v\n", segmentType)
  fmt.Printf("%+v\n", tcData.CoreString)
  fmt.Printf("%+v\n", tcData.DisclosedVendors)
  fmt.Printf("%+v\n", tcData.PublisherTC)
}

Encode a TC String

To encode a TC String, use ToTCString() string on the TCData structure.

To encode a single segment of a TC String, use Encode() string on the appropriate segment.

Example

package main

import (
  "fmt"
  "github.com/SirDataFR/iabtcfv2"
)

func main() {
  tcData := &TCData{
    CoreString: &CoreString{
      Version: 2,
      Created: time.Now(),
      LastUpdated: time.Now(),
      CmpId: 92,
      CmpVersion: 1,
      ConsentScreen: 1,
      ConsentLanguage: "EN",
      VendorListVersion: 32,
      TcfPolicyVersion: 2,
      PurposesConsent: map[int]bool{
        1:  true,
        2:  true,
        3:  true,
      },
    },
  }
  
  tcString := tcData.ToTCString()
  fmt.Printf("%v", tcString)
  
  segmentValue := tcData.CoreString.Encode()
  fmt.Printf("%v", segmentValue)
}

Read TC Data

To verify that a legal basis is established for a purpose or a vendor, use the functions on each structure.

CoreString

Function	Parameter	Description
IsSpecialFeatureAllowed	int	Returns true if user has given consent to special feature id
IsPurposeAllowed	int	Returns true if user has given consent to purpose id
IsPurposeLIAllowed	int	Returns true if legitimate interest is established for purpose id and user didn't exercise their right to object
IsVendorAllowed	int	Returns true if user has given consent to vendor id processing their personal data
IsVendorLIAllowed	int	Returns true if transparency for vendor id's legitimate interest is established and user didn't exercise their right to object
IsVendorAllowedForPurposes	(int, ...int)	Returns true if user has given consent to vendor id processing all purposes ids and publisher hasn't set restrictions for them
IsVendorAllowedForPurposesLI	(int, ...int)	Returns true if transparency for vendor id's legitimate interest is established for all purpose ids and publisher hasn't set restrictions for them
IsVendorAllowedForFlexiblePurposes	(int, ...int)	Returns true if user has given consent to vendor id processing all purposes ids or if transparency for its legitimate interest is established in accordance with publisher restrictions
IsVendorAllowedForFlexiblePurposesLI	(int, ...int)	Returns true if transparency for vendor id's legitimate interest is established for all purpose ids or if user has given consent in accordance with publisher restrictions
GetPubRestrictionsForPurpose	int	Returns a list of publisher restrictions applied to purpose id

NOTE: For convenience the CoreString functions are also available from the TCData structure.

DisclosedVendors

Function	Parameter	Description
IsVendorDisclosed	int	Returns true if vendor id is disclosed for validating OOB signaling

PublisherTC

Function	Parameter	Description
IsPurposeAllowed	int	Returns true if user has given consent to standard purpose id
IsPurposeLIAllowed	int	Returns true if legitimate interest is established for standard purpose id and user didn't exercise their right to object
IsCustomPurposeAllowed	int	Returns true if user has given consent to custom purpose id
IsCustomPurposeLIAllowed	int	Returns true if legitimate interest is established for custom purpose id and user didn't exercise their right to object

Example

package main

import (
  "fmt"
  "github.com/SirDataFR/iabtcfv2"
)

func main() {
  tcString := "COxSKBCOxSKCCBcABCENAgCMAPzAAEPAAAqIDaQBQAMgAgABqAR0A2gDaQAwAMgAgANoAAA.elAAAAAAAWA"
  
  var tcData, err = iabtcfv2.Decode(tcString)
  if err != nil {
    fmt.Printf("%v", err)
  }
  
  if tcData.IsPurposeAllowed(1) {
    fmt.Printf("user has given consent to purpose 1")
  }
  
  if tcData.IsVendorAllowed(53) {
    fmt.Printf("user has given consent to vendor 53")
  }
  
  if tcData.PublisherTC.IsPurposeAllowed(2) {
    fmt.Printf("user has given consent to publisher purpose 2")
  }
}