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Example Input: +15555555555 Output: SMS Input: 15555555555 Output: SMS Input: +15555555555555555 Output: INVALID_ADDRESS Input: whatsapp:15555555555 Output: WHATSAPP Input: wechat:identifier:ghke83772 Output: INVALID_ADDRESS Input: wechat:ghke83772 Output: WECHAT Input: whatsapp: +15555555555 Output: WHATSAPP Input: messenger:15555555555 Output: MESSENGER Input: messenger:+15555555555 Output: MESSENGER Input: messenger: +15555555555555555 Output: INVALID_ADDRESS Input: whatsapp:this_is_not_an_E164_number Output: INVALID_ADDRESS Input: messenger: this_is_not_an_E164_number Output: INVALID_ADDRESS Input: wechat:this_is_alphanumeric_with_special_character Output: WECHAT

Example Input: +15555555555 Output: SMS Input: 15555555555 Output: SMS Input: +15555555555555555 Output: INVALID_ADDRESS Input: whatsapp:15555555555 Output: WHATSAPP Input: wechat:identifier:ghke83772 Output: INVALID_ADDRESS Input: wechat:ghke83772 Output: WECHAT Input: whatsapp: +15555555555 Output: WHATSAPP Input: messenger:15555555555 Output: MESSENGER Input: messenger:+15555555555 Output: MESSENGER Input: messenger: +15555555555555555 Output: INVALID_ADDRESS Input: whatsapp:this_is_not_an_E164_number Output: INVALID_ADDRESS Input: messenger: this_is_not_an_E164_number Output: INVALID_ADDRESS Input: wechat:this_is_alphanumeric_with_special_character Output: WECHAT

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Example

Input: +15555555555 Output: SMS

Input: 15555555555 Output: SMS

Input: +15555555555555555 Output: INVALID_ADDRESS

Input: whatsapp:15555555555 Output: WHATSAPP

Input: wechat:identifier:ghke83772 Output: INVALID_ADDRESS

Input: wechat:ghke83772 Output: WECHAT

Input: whatsapp: +15555555555 Output: WHATSAPP

Input: messenger:15555555555 Output: MESSENGER

Input: messenger:+15555555555 Output: MESSENGER

Input: messenger: +15555555555555555 Output: INVALID_ADDRESS

Input: whatsapp:this_is_not_an_E164_number Output: INVALID_ADDRESS

Input: messenger: this_is_not_an_E164_number Output: INVALID_ADDRESS

Input: wechat:this_is_alphanumeric_with_special_character Output: WECHAT

Given: • address: A string containing the telephone number or provider:identifier channel string Write: • A function that validates the address and returns where to route the message to The return value will be one of: O For address strings with invalid formatting. return "INVALID_ADDRESS" o For valid E.164 format addresses, return "SMS" O For other channels, return the provider string as "WHATSAPP", "WECHAT", or "MESSENGER" Constraints • The address will be a string between 1- 258 characters long • E.164 numbers • May optionally start with '+' o Will have up to 15 digits in length (not including the +') o Digits can be between 0-9. The first digit can never be 0. • Other channel addresses • No whitespace allowed • The provider and identifier will always be separated by one colon {provider}:{identifier} o Valid providers are: whatsapp, wechat, and messenger · Inputs could be lower or upper case, but outputs should always be uppercase o Valid identifiers · Identifiers are between 1 and 248 characters long whatsapp and messenger identifiers must specifically be E.164 numbers
Transcribed Image Text:Given: • address: A string containing the telephone number or provider:identifier channel string Write: • A function that validates the address and returns where to route the message to The return value will be one of: O For address strings with invalid formatting. return "INVALID_ADDRESS" o For valid E.164 format addresses, return "SMS" O For other channels, return the provider string as "WHATSAPP", "WECHAT", or "MESSENGER" Constraints • The address will be a string between 1- 258 characters long • E.164 numbers • May optionally start with '+' o Will have up to 15 digits in length (not including the +') o Digits can be between 0-9. The first digit can never be 0. • Other channel addresses • No whitespace allowed • The provider and identifier will always be separated by one colon {provider}:{identifier} o Valid providers are: whatsapp, wechat, and messenger · Inputs could be lower or upper case, but outputs should always be uppercase o Valid identifiers · Identifiers are between 1 and 248 characters long whatsapp and messenger identifiers must specifically be E.164 numbers
2. What's in a number? Prompt What's in a number? In addition to using typical "addresses" (i.e. phone numbers) for SMS messages, Twilio supports sending messages through different channels such as wechat, whatsapp and messenger. These other channels have their own address formats. Twilio uses a standardized phone number format for SMS messages called E.164 phone numbers. Some examples of valid E.164 numbers are: • +15555555555 • +34864683619 • +61491570156 • 913858210056 For other channels messaging, they have addresses that are formatted differently to indicate the provider responsible to route the message to. Some examples of these provider/identifier combinations are: • whatsapp:34864683619 • messenger:+12025550001 • wechat:gh_a1f37dacefe3 All these values are passed around as strings. It is important that we validate the format is correct for these addresses, as well as identify the appropriate provider to route the message to. We are asking you to build a function that validates that the address (which is either a standard phone number, or a provider/identifier combo) is formatted correctly, and then returns which channel to route the message to.
Transcribed Image Text:2. What's in a number? Prompt What's in a number? In addition to using typical "addresses" (i.e. phone numbers) for SMS messages, Twilio supports sending messages through different channels such as wechat, whatsapp and messenger. These other channels have their own address formats. Twilio uses a standardized phone number format for SMS messages called E.164 phone numbers. Some examples of valid E.164 numbers are: • +15555555555 • +34864683619 • +61491570156 • 913858210056 For other channels messaging, they have addresses that are formatted differently to indicate the provider responsible to route the message to. Some examples of these provider/identifier combinations are: • whatsapp:34864683619 • messenger:+12025550001 • wechat:gh_a1f37dacefe3 All these values are passed around as strings. It is important that we validate the format is correct for these addresses, as well as identify the appropriate provider to route the message to. We are asking you to build a function that validates that the address (which is either a standard phone number, or a provider/identifier combo) is formatted correctly, and then returns which channel to route the message to.
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