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helpers.rs
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/
helpers.rs
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// This module contains helpers for rendering templates. These helpers can
// be registered with the Handlebars library to assist in manipulating
// text at render time.
use base64::Engine;
use bottlerocket_modeled_types::{OciDefaultsCapability, OciDefaultsResourceLimitType};
use dns_lookup::lookup_host;
use handlebars::{
handlebars_helper, Context, Handlebars, Helper, HelperDef, Output, RenderContext, RenderError,
Renderable,
};
use lazy_static::lazy_static;
use serde::Deserialize;
use serde_json::value::Value;
use serde_plain::derive_fromstr_from_deserialize;
use settings_extension_oci_defaults::OciDefaultsResourceLimitV1;
use snafu::{OptionExt, ResultExt};
use std::borrow::Borrow;
use std::collections::HashMap;
use std::convert::TryFrom;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
use std::str::FromStr;
use url::Url;
lazy_static! {
/// A map to tell us which registry to pull ECR images from for a given region.
static ref ECR_MAP: HashMap<&'static str, &'static str> = {
let mut m = HashMap::new();
m.insert("af-south-1", "917644944286");
m.insert("ap-east-1", "375569722642");
m.insert("ap-northeast-1", "328549459982");
m.insert("ap-northeast-2", "328549459982");
m.insert("ap-northeast-3", "328549459982");
m.insert("ap-south-1", "328549459982");
m.insert("ap-south-2", "764716012617");
m.insert("ap-southeast-1", "328549459982");
m.insert("ap-southeast-2", "328549459982");
m.insert("ap-southeast-3", "386774335080");
m.insert("ap-southeast-4", "731751899352");
m.insert("ap-southeast-5", "851725293737");
m.insert("ca-central-1", "328549459982");
m.insert("ca-west-1", "253897149516");
m.insert("cn-north-1", "183470599484");
m.insert("cn-northwest-1", "183901325759");
m.insert("eu-central-1", "328549459982");
m.insert("eu-central-2", "861738308508");
m.insert("eu-isoe-west-1", "589460436674");
m.insert("eu-north-1", "328549459982");
m.insert("eu-south-1", "586180183710");
m.insert("eu-south-2", "620625777247");
m.insert("eu-west-1", "328549459982");
m.insert("eu-west-2", "328549459982");
m.insert("eu-west-3", "328549459982");
m.insert("il-central-1", "288123944683");
m.insert("me-central-1", "553577323255");
m.insert("me-south-1", "509306038620");
m.insert("sa-east-1", "328549459982");
m.insert("us-east-1", "328549459982");
m.insert("us-east-2", "328549459982");
m.insert("us-gov-east-1", "388230364387");
m.insert("us-gov-west-1", "347163068887");
m.insert("us-west-1", "328549459982");
m.insert("us-west-2", "328549459982");
m
};
}
/// But if there is a region that does not exist in our map (for example a new
/// region is created or being tested), then we will fallback to pulling ECR
/// containers from here.
const ECR_FALLBACK_REGION: &str = "us-east-1";
const ECR_FALLBACK_REGISTRY: &str = "328549459982";
lazy_static! {
/// A map to tell us which endpoint to pull updates from for a given region.
static ref TUF_ENDPOINT_MAP: HashMap<&'static str, &'static str> = {
let mut m = HashMap::new();
m.insert("cn-north-1", "bottlerocket-updates-cn-north-1.s3.dualstack");
m.insert("cn-northwest-1", "bottlerocket-updates-cn-northwest-1.s3.dualstack");
m.insert("eu-isoe-west-1", "bottlerocket-updates-eu-isoe-west-1.s3");
m
};
}
const TUF_PUBLIC_REPOSITORY: &str = "https://updates.bottlerocket.aws";
lazy_static! {
/// A map to tell us the partition for a given non-standard region.
static ref ALT_PARTITION_MAP: HashMap<&'static str, &'static str> = {
let mut m = HashMap::new();
m.insert("cn-north-1", "aws-cn");
m.insert("cn-northwest-1", "aws-cn");
m.insert("eu-isoe-west-1", "aws-iso-e");
m.insert("us-gov-east-1", "aws-us-gov");
m.insert("us-gov-west-1", "aws-us-gov");
m
};
}
/// The partition for standard AWS regions.
const STANDARD_PARTITION: &str = "aws";
/// The amount of CPU to reserve
/// We are using these CPU ranges from GKE
/// (https://cloud.google.com/kubernetes-engine/docs/concepts/cluster-architecture#node_allocatable):
/// 6% of the first core
/// 1% of the next core (up to 2 cores)
/// 0.5% of the next 2 cores (up to 4 cores)
/// 0.25% of any cores above 4 cores
const KUBE_RESERVE_1_CORE: f32 = 60.0;
const KUBE_RESERVE_2_CORES: f32 = KUBE_RESERVE_1_CORE + 10.0;
const KUBE_RESERVE_3_CORES: f32 = KUBE_RESERVE_2_CORES + 5.0;
const KUBE_RESERVE_4_CORES: f32 = KUBE_RESERVE_3_CORES + 5.0;
const KUBE_RESERVE_ADDITIONAL: f32 = 2.5;
const IPV4_LOCALHOST: IpAddr = IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1));
const IPV6_LOCALHOST: IpAddr = IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
const DEFAULT_ECS_METADATA_SERVICE_RPS: i32 = 40;
const DEFAULT_ECS_METADATA_SERVICE_BURST: i32 = 60;
/// Potential errors during helper execution
mod error {
use handlebars::RenderError;
use snafu::Snafu;
#[derive(Debug, Snafu)]
#[snafu(visibility(pub(super)))]
pub(super) enum TemplateHelperError {
#[snafu(display("Expected an AWS region, got '{}' in template {}", value, template))]
AwsRegion {
value: handlebars::JsonValue,
template: String,
},
#[snafu(display(
"Incorrect number of params provided to helper '{}' in template '{}' - {} expected, {} received",
helper,
template,
expected,
received,
))]
IncorrectNumberOfParams {
expected: usize,
received: usize,
helper: String,
template: String,
},
#[snafu(display("Internal error: {}", msg))]
Internal { msg: String },
#[snafu(display("Internal error: Missing param after confirming that it existed."))]
ParamUnwrap {},
#[snafu(display("Invalid OCI spec section: {}", source))]
InvalidOciSpecSection { source: serde_plain::Error },
// handlebars::JsonValue is a serde_json::Value, which implements
// the 'Display' trait and should provide valuable context
#[snafu(display(
"Invalid template value, expected {}, got '{}' in template {}",
expected,
value,
template
))]
InvalidTemplateValue {
expected: &'static str,
value: handlebars::JsonValue,
template: String,
},
#[snafu(display(
"Unable to parse template value, expected {}, got '{}' in template {}: '{}'",
expected,
value,
template,
source,
))]
UnparseableTemplateValue {
source: serde_json::Error,
expected: &'static str,
value: handlebars::JsonValue,
template: String,
},
#[snafu(display(
"The join_array helper expected type '{}' while processing '{}' for template '{}'",
expected_type,
value,
template
))]
JoinStringsWrongType {
expected_type: &'static str,
value: handlebars::JsonValue,
template: String,
},
#[snafu(display("Missing param {} for helper '{}'", index, helper_name))]
MissingParam { index: usize, helper_name: String },
#[snafu(display(
"Missing parameter path for param {} for helper '{}'",
index,
helper_name
))]
MissingParamPath { index: usize, helper_name: String },
#[snafu(display(
"Missing data and fail-if-missing was set; see given line/col in template '{}'",
template,
))]
MissingTemplateData { template: String },
#[snafu(display("Unable to decode base64 in template '{}': '{}'", template, source))]
Base64Decode {
template: String,
source: base64::DecodeError,
},
#[snafu(display(
"Invalid (non-utf8) output from base64 string '{}' in template '{}': '{}'",
base64_string,
template,
source
))]
InvalidUTF8 {
base64_string: String,
template: String,
source: std::str::Utf8Error,
},
#[snafu(display("Unable to write template '{}': '{}'", template, source))]
TemplateWrite {
template: String,
source: std::io::Error,
},
#[snafu(display(
"Unable to encode input '{}' from template '{}' as toml: {}",
value,
source,
template
))]
TomlEncode {
value: serde_json::Value,
source: serde_json::Error,
template: String,
},
#[snafu(display("Unknown architecture '{}' given to goarch helper", given))]
UnknownArch { given: String },
#[snafu(display(
"Expected an absolute URL, got '{}' in template '{}': '{}'",
url_str,
template,
source
))]
UrlParse {
url_str: String,
template: String,
source: url::ParseError,
},
#[snafu(display("URL '{}' is missing host component", url_str))]
UrlHost { url_str: String },
#[snafu(display("Failed to convert {} {} to {}", what, number, target))]
ConvertNumber {
what: String,
number: String,
target: String,
},
#[snafu(display("Failed to convert usize {} to u16: {}", number, source))]
ConvertUsizeToU16 {
number: usize,
source: std::num::TryFromIntError,
},
#[snafu(display("Invalid output type '{}', expected 'docker' or 'containerd'", runtime))]
InvalidOutputType {
source: serde_plain::Error,
runtime: String,
},
#[snafu(display("Invalid metadata service limits '{},{}'", rps, burst))]
InvalidMetadataServiceLimits {
rps: handlebars::JsonValue,
burst: handlebars::JsonValue,
},
}
// Handlebars helpers are required to return a RenderError.
// Implement "From" for TemplateHelperError.
impl From<TemplateHelperError> for RenderError {
fn from(e: TemplateHelperError) -> RenderError {
RenderError::from_error("TemplateHelperError", e)
}
}
}
use error::TemplateHelperError;
/// `base64_decode` decodes base64 encoded text at template render time.
/// It takes a single variable as a parameter: {{base64_decode var}}
pub fn base64_decode(
helper: &Helper<'_, '_>,
_: &Handlebars,
_: &Context,
renderctx: &mut RenderContext<'_, '_>,
out: &mut dyn Output,
) -> Result<(), RenderError> {
// To give context to our errors, get the template name, if available.
trace!("Starting base64_decode helper");
let template_name = template_name(renderctx);
trace!("Template name: {}", &template_name);
// Check number of parameters, must be exactly one
trace!("Number of params: {}", helper.params().len());
check_param_count(helper, template_name, 1)?;
// Get the resolved key out of the template (param(0)). value() returns
// a serde_json::Value
let base64_value = helper
.param(0)
.map(|v| v.value())
.context(error::ParamUnwrapSnafu {})?;
trace!("Base64 value from template: {}", base64_value);
// Create an &str from the serde_json::Value
let base64_str = base64_value
.as_str()
.context(error::InvalidTemplateValueSnafu {
expected: "string",
value: base64_value.to_owned(),
template: template_name.to_owned(),
})?;
trace!("Base64 string from template: {}", base64_str);
// Base64 decode the &str
let decoded_bytes = base64::engine::general_purpose::STANDARD
.decode(base64_str)
.context(error::Base64DecodeSnafu {
template: template_name.to_owned(),
})?;
// Create a valid utf8 str
let decoded = std::str::from_utf8(&decoded_bytes).context(error::InvalidUTF8Snafu {
base64_string: base64_str.to_string(),
template: template_name.to_owned(),
})?;
trace!("Decoded base64: {}", decoded);
// Write the string out to the template
out.write(decoded).context(error::TemplateWriteSnafu {
template: template_name.to_owned(),
})?;
Ok(())
}
/// `join_map` lets you join together strings in a map with given characters, for example when
/// you're writing values out to a configuration file.
///
/// The map is expected to be a single level deep, with string keys and string values.
///
/// The first parameter is the character to use to join keys to values; the second parameter is the
/// character to use to join pairs; the third parameter is the name of the map. The third
/// parameter is a literal string that describes the behavior you want if the map is missing from
/// settings; "fail-if-missing" to fail the template, or "no-fail-if-missing" to continue but write
/// out nothing for this invocation of the helper.
///
/// Example:
/// {{ join_map "=" "," "fail-if-missing" map }}
/// ...where `map` is: {"hi": "there", "whats": "up"}
/// ...will produce: "hi=there,whats=up"
pub fn join_map(
helper: &Helper<'_, '_>,
_: &Handlebars,
_: &Context,
renderctx: &mut RenderContext<'_, '_>,
out: &mut dyn Output,
) -> Result<(), RenderError> {
trace!("Starting join_map helper");
let template_name = template_name(renderctx);
trace!("Template name: {}", &template_name);
trace!("Number of params: {}", helper.params().len());
check_param_count(helper, template_name, 4)?;
// Pull out the parameters and confirm their types
let join_key_val = get_param(helper, 0)?;
let join_key = join_key_val
.as_str()
.with_context(|| error::InvalidTemplateValueSnafu {
expected: "string",
value: join_key_val.to_owned(),
template: template_name.to_owned(),
})?;
trace!("Character used to join keys to values: {}", join_key);
let join_pairs_val = get_param(helper, 1)?;
let join_pairs = join_pairs_val
.as_str()
.with_context(|| error::InvalidTemplateValueSnafu {
expected: "string",
value: join_pairs_val.to_owned(),
template: template_name.to_owned(),
})?;
trace!("Character used to join pairs: {}", join_pairs);
let fail_behavior_val = get_param(helper, 2)?;
let fail_behavior_str =
fail_behavior_val
.as_str()
.with_context(|| error::InvalidTemplateValueSnafu {
expected: "string",
value: join_pairs_val.to_owned(),
template: template_name.to_owned(),
})?;
let fail_if_missing = match fail_behavior_str {
"fail-if-missing" => true,
"no-fail-if-missing" => false,
_ => {
return Err(RenderError::from(
error::TemplateHelperError::InvalidTemplateValue {
expected: "fail-if-missing or no-fail-if-missing",
value: fail_behavior_val.to_owned(),
template: template_name.to_owned(),
},
))
}
};
trace!(
"Will we fail if missing the specified map: {}",
fail_if_missing
);
let map_value = get_param(helper, 3)?;
// If the requested setting is not set, we check the user's requested fail-if-missing behavior
// to determine whether to fail hard or just write nothing quietly.
if !map_value.is_object() {
if fail_if_missing {
return Err(RenderError::from(
error::TemplateHelperError::MissingTemplateData {
template: template_name.to_owned(),
},
));
} else {
return Ok(());
}
}
let map = map_value.as_object().context(error::InternalSnafu {
msg: "Already confirmed map is_object but as_object failed",
})?;
trace!("Map to join: {:?}", map);
// Join the key/value pairs with requested string
let mut pairs = Vec::new();
for (key, val_value) in map.into_iter() {
// We don't want the JSON form of scalars, we want the Display form of the Rust type inside.
let val = match val_value {
// these ones Display as their simple scalar selves
Value::Bool(b) => b.to_string(),
Value::Number(n) => n.to_string(),
Value::String(s) => s.to_string(),
// Null not supported; probably don't want blanks in config files, and we don't have a
// use for this yet; consider carefully if/when we do
Value::Null => {
return Err(RenderError::from(
error::TemplateHelperError::InvalidTemplateValue {
expected: "non-null",
value: val_value.to_owned(),
template: template_name.to_owned(),
},
))
}
// composite types unsupported
Value::Array(_) | Value::Object(_) => {
return Err(RenderError::from(
error::TemplateHelperError::InvalidTemplateValue {
expected: "scalar",
value: val_value.to_owned(),
template: template_name.to_owned(),
},
))
}
};
// Do the actual key/value join.
pairs.push(format!("{}{}{}", key, join_key, val));
}
// Join all pairs with the given string.
let joined = pairs.join(join_pairs);
trace!("Joined output: {}", joined);
// Write the string out to the template
out.write(&joined).context(error::TemplateWriteSnafu {
template: template_name.to_owned(),
})?;
Ok(())
}
/// `join_node_taints` is a specialized version of `join_map` that joins the kubernetes node taints
/// setting in the correct format `kubelet` expects for its `--register-with-taints` option.
///
/// Example:
/// {{ join_node_taints settings.kubernetes.node-taints }}
/// ...where `settings.kubernetes.node-taints` is: {"key1": ["value1:NoSchedule","value1:NoExecute"], "key2": ["value2:NoSchedule"]}
/// ...will produce: "key1=value1:NoSchedule,key1=value1:NoExecute,key2=value2:NoSchedule"
pub fn join_node_taints(
helper: &Helper<'_, '_>,
_: &Handlebars,
_: &Context,
renderctx: &mut RenderContext<'_, '_>,
out: &mut dyn Output,
) -> Result<(), RenderError> {
trace!("Starting join_node_taints helper");
let template_name = template_name(renderctx);
trace!("Template name: {}", &template_name);
trace!("Number of params: {}", helper.params().len());
check_param_count(helper, template_name, 1)?;
let node_taints_value = get_param(helper, 0)?;
// It's ok if there are no node-taints, output nothing
if !node_taints_value.is_object() {
return Ok(());
}
let node_taints = node_taints_value
.as_object()
.context(error::InternalSnafu {
msg: "Already confirmed map is_object but as_object failed",
})?;
trace!("node taints to join: {:?}", node_taints);
// Join the key/value pairs for node taints
let mut pairs = Vec::new();
for (key, val_value) in node_taints.into_iter() {
match val_value {
Value::Array(values) => {
for taint_value in values {
if let Some(taint_str) = taint_value.as_str() {
pairs.push(format!("{}={}", key, taint_str));
} else {
return Err(RenderError::from(
error::TemplateHelperError::InvalidTemplateValue {
expected: "string",
value: taint_value.to_owned(),
template: template_name.to_owned(),
},
));
}
}
}
Value::Null => {
return Err(RenderError::from(
error::TemplateHelperError::InvalidTemplateValue {
expected: "non-null",
value: val_value.to_owned(),
template: template_name.to_owned(),
},
))
}
// all other types unsupported
_ => {
return Err(RenderError::from(
error::TemplateHelperError::InvalidTemplateValue {
expected: "sequence",
value: val_value.to_owned(),
template: template_name.to_owned(),
},
))
}
};
}
// Join all pairs with the given string.
let joined = pairs.join(",");
trace!("Joined output: {}", joined);
// Write the string out to the template
out.write(&joined).context(error::TemplateWriteSnafu {
template: template_name.to_owned(),
})?;
Ok(())
}
/// `default` lets you specify the default value for a key in a template in case that key isn't
/// set. The first argument is the default (scalar) value; the second argument is the key (with
/// scalar value) to check and insert if it is set.
pub fn default(
helper: &Helper<'_, '_>,
_: &Handlebars,
_: &Context,
renderctx: &mut RenderContext<'_, '_>,
out: &mut dyn Output,
) -> Result<(), RenderError> {
trace!("Starting default helper");
let template_name = template_name(renderctx);
trace!("Template name: {}", &template_name);
trace!("Number of params: {}", helper.params().len());
check_param_count(helper, template_name, 2)?;
// Pull out the parameters and confirm their types
let default_val = get_param(helper, 0)?;
let default = match default_val {
// these ones Display as their simple scalar selves
Value::Bool(b) => b.to_string(),
Value::Number(n) => n.to_string(),
Value::String(s) => s.to_string(),
// Null isn't allowed - we're here to give a default!
// And composite types are unsupported.
Value::Null | Value::Array(_) | Value::Object(_) => {
return Err(RenderError::from(
error::TemplateHelperError::InvalidTemplateValue {
expected: "non-null scalar",
value: default_val.to_owned(),
template: template_name.to_owned(),
},
))
}
};
trace!("Default value if key is not set: {}", default);
let requested_value = get_param(helper, 1)?;
let value = match requested_value {
// these ones Display as their simple scalar selves
Value::Bool(b) => b.to_string(),
Value::Number(n) => n.to_string(),
Value::String(s) => s.to_string(),
// If no value is set, use the given default.
Value::Null => default,
// composite types unsupported
Value::Array(_) | Value::Object(_) => {
return Err(RenderError::from(
error::TemplateHelperError::InvalidTemplateValue {
expected: "scalar",
value: requested_value.to_owned(),
template: template_name.to_owned(),
},
))
}
};
// Write the string out to the template
out.write(&value).context(error::TemplateWriteSnafu {
template: template_name.to_owned(),
})?;
Ok(())
}
/// The `if_not_null` helper is used to check when a value is not null. This is
/// useful especially for falsy values such as `false`, `0`, or `""` to
/// distinguish between "not set" and "false".
#[derive(Clone, Copy)]
pub struct IfNotNullHelper;
impl HelperDef for IfNotNullHelper {
fn call<'reg: 'rc, 'rc>(
&self,
helper: &Helper<'reg, 'rc>,
registry: &'reg Handlebars<'reg>,
ctx: &'rc Context,
renderctx: &mut RenderContext<'reg, 'rc>,
out: &mut dyn Output,
) -> Result<(), RenderError> {
trace!("Starting if_not_null helper");
let template_name = template_name(renderctx);
trace!("Template name: {}", &template_name);
trace!("Number of params: {}", helper.params().len());
check_param_count(helper, template_name, 1)?;
let param = get_param(helper, 0)?;
let tmpl = if !param.is_null() {
helper.template()
} else {
helper.inverse()
};
match tmpl {
Some(t) => t.render(registry, ctx, renderctx, out),
None => Ok(()),
}
}
}
/// The `ecr-prefix` helper is used to map an AWS region to the correct ECR
/// registry.
///
/// Initially we held all of our ECR repos in a single registry, but with some
/// regions this was no longer possible. Because the ECR repo URL includes the
/// the registry number, we created this helper to lookup the correct registry
/// number for a given region.
///
/// This helper takes the AWS region as its only parameter, and returns the
/// fully qualified domain name to the correct ECR registry.
///
/// # Fallback
///
/// A map of region to ECR registry ID is maintained herein. But if we do not
/// have the region in our map, a fallback region and registry number are
/// returned. This would allow a version of Bottlerocket to run in a new region
/// before this map has been updated.
///
/// # Example
///
/// In this example the registry number for the region will be returned.
/// `{{ ecr-prefix settings.aws.region }}`
///
/// This would result in something like:
/// `328549459982.dkr.ecr.eu-central-1.amazonaws.com`
pub fn ecr_prefix(
helper: &Helper<'_, '_>,
_: &Handlebars,
_: &Context,
renderctx: &mut RenderContext<'_, '_>,
out: &mut dyn Output,
) -> Result<(), RenderError> {
trace!("Starting ecr helper");
let template_name = template_name(renderctx);
check_param_count(helper, template_name, 1)?;
// get the region parameter, which is probably given by the template value
// settings.aws.region. regardless, we expect it to be a string.
let aws_region = get_param(helper, 0)?;
let aws_region = aws_region.as_str().with_context(|| error::AwsRegionSnafu {
value: aws_region.to_owned(),
template: template_name,
})?;
// construct the registry fqdn
let ecr_registry = ecr_registry(aws_region);
// write it to the template
out.write(&ecr_registry)
.with_context(|_| error::TemplateWriteSnafu {
template: template_name.to_owned(),
})?;
Ok(())
}
/// The `tuf-prefix` helper is used to map an AWS region to the correct TUF
/// repository.
///
/// This helper takes the AWS region as its only parameter, and returns the
/// fully qualified domain name to the correct TUF repository.
///
/// # Fallback
///
/// A map of region to TUF repository endpoint is maintained herein. But if we
/// do not have the region in our map, a fallback repository is returned. This
/// would allow a version of Bottlerocket to run in a new region before this map
/// has been updated.
///
/// # Example
///
/// In this example the repository endpoint for the region will be returned.
/// `{{ tuf-prefix settings.aws.region }}`
///
/// This would result in something like:
/// `https://bottlerocket-updates-us-west-2.s3.dualstack.us-west-2.amazonaws.com/latest`
pub fn tuf_prefix(
helper: &Helper<'_, '_>,
_: &Handlebars,
_: &Context,
renderctx: &mut RenderContext<'_, '_>,
out: &mut dyn Output,
) -> Result<(), RenderError> {
trace!("Starting tuf helper");
let template_name = template_name(renderctx);
check_param_count(helper, template_name, 1)?;
// get the region parameter, which is probably given by the template value
// settings.aws.region. regardless, we expect it to be a string.
let aws_region = get_param(helper, 0)?;
let aws_region = aws_region.as_str().with_context(|| error::AwsRegionSnafu {
value: aws_region.to_owned(),
template: template_name,
})?;
// construct the registry fqdn
let tuf_repository = tuf_repository(aws_region);
// write it to the template
out.write(&tuf_repository)
.with_context(|_| error::TemplateWriteSnafu {
template: template_name.to_owned(),
})?;
Ok(())
}
/// The `metadata-prefix` helper is used to map an AWS region to the correct
/// metadata location inside of the TUF repository.
///
/// This helper takes the AWS region as its only parameter, and returns the
/// prefix of the metadata.
///
pub fn metadata_prefix(
helper: &Helper<'_, '_>,
_: &Handlebars,
_: &Context,
renderctx: &mut RenderContext<'_, '_>,
out: &mut dyn Output,
) -> Result<(), RenderError> {
trace!("Starting tuf helper");
let template_name = template_name(renderctx);
check_param_count(helper, template_name, 1)?;
// get the region parameter, which is probably given by the template value
// settings.aws.region. regardless, we expect it to be a string.
let aws_region = get_param(helper, 0)?;
let aws_region = aws_region.as_str().with_context(|| error::AwsRegionSnafu {
value: aws_region.to_owned(),
template: template_name,
})?;
// construct the prefix
let metadata_location = if TUF_ENDPOINT_MAP.contains_key(aws_region) {
"/metadata"
} else {
""
};
// write it to the template
out.write(metadata_location)
.with_context(|_| error::TemplateWriteSnafu {
template: template_name.to_owned(),
})?;
Ok(())
}
/// `host` takes an absolute URL and trims it down and returns its host.
pub fn host(
helper: &Helper<'_, '_>,
_: &Handlebars,
_: &Context,
renderctx: &mut RenderContext<'_, '_>,
out: &mut dyn Output,
) -> Result<(), RenderError> {
trace!("Starting host helper");
let template_name = template_name(renderctx);
check_param_count(helper, template_name, 1)?;
let url_val = get_param(helper, 0)?;
let url_str = url_val
.as_str()
.with_context(|| error::InvalidTemplateValueSnafu {
expected: "string",
value: url_val.to_owned(),
template: template_name.to_owned(),
})?;
let url = Url::parse(url_str).context(error::UrlParseSnafu {
url_str,
template: template_name,
})?;
let url_host = url.host_str().context(error::UrlHostSnafu { url_str })?;
// write it to the template
out.write(url_host)
.with_context(|_| error::TemplateWriteSnafu {
template: template_name.to_owned(),
})?;
Ok(())
}
/// `goarch` takes one parameter, the name of a machine architecture, and converts it to the "Go"
/// form, so named because its use in golang popularized it elsewhere.
///
/// The canonical architecture names in Bottlerocket are things like "x86_64" and "aarch64"; goarch
/// converts these to "amd64" and "arm64", etc.
pub fn goarch(
helper: &Helper<'_, '_>,
_: &Handlebars,
_: &Context,
renderctx: &mut RenderContext<'_, '_>,
out: &mut dyn Output,
) -> Result<(), RenderError> {
trace!("Starting goarch helper");
let template_name = template_name(renderctx);
check_param_count(helper, template_name, 1)?;
// Retrieve the given arch string
let arch_val = get_param(helper, 0)?;
let arch_str = arch_val
.as_str()
.with_context(|| error::InvalidTemplateValueSnafu {
expected: "string",
value: arch_val.to_owned(),
template: template_name.to_owned(),
})?;
// Transform the arch string
let goarch = match arch_str {
"x86_64" | "amd64" => "amd64",
"aarch64" | "arm64" => "arm64",
_ => {
return Err(RenderError::from(error::TemplateHelperError::UnknownArch {
given: arch_str.to_string(),
}))
}
};
// write it to the template
out.write(goarch)
.with_context(|_| error::TemplateWriteSnafu {
template: template_name.to_owned(),
})?;
Ok(())
}
/// `join_array` is used to join an array of scalar strings into an array of
/// quoted, delimited strings. The delimiter must be specified.
///
/// # Example
///
/// Consider an array of values: `[ "a", "b", "c" ]` stored in a setting such as
/// `settings.somewhere.foo-list`. In our template we can write:
/// `{{ join_array ", " settings.somewhere.foo-list }}`
///
/// This will render `"a", "b", "c"`.
pub fn join_array(
helper: &Helper<'_, '_>,
_: &Handlebars,
_: &Context,
renderctx: &mut RenderContext<'_, '_>,
out: &mut dyn Output,
) -> Result<(), RenderError> {
trace!("Starting join_array helper");
let template_name = template_name(renderctx);
check_param_count(helper, template_name, 2)?;
// get the delimiter
let delimiter_param = get_param(helper, 0)?;
let delimiter = delimiter_param
.as_str()
.with_context(|| error::JoinStringsWrongTypeSnafu {
expected_type: "string",
value: delimiter_param.to_owned(),
template: template_name,
})?;
// get the array
let array_param = get_param(helper, 1)?;
let array = array_param
.as_array()
.with_context(|| error::JoinStringsWrongTypeSnafu {
expected_type: "array",
value: array_param.to_owned(),
template: template_name,
})?;
let mut result = String::new();
for (i, value) in array.iter().enumerate() {
if i > 0 {
result.push_str(delimiter);
}
result.push_str(
format!(
"\"{}\"",
value.as_str().context(error::JoinStringsWrongTypeSnafu {
expected_type: "string",
value: value.to_owned(),
template: template_name,
})?
)
.as_str(),
);
}
// write it to the template
out.write(&result)
.with_context(|_| error::TemplateWriteSnafu {
template: template_name.to_owned(),
})?;
Ok(())
}
/// `toml_encode` accepts arbitrary input and encodes it as a toml string
///
/// # Example
///
/// Consider an array of values: `[ "a", "b", "c" ]` stored in a setting such as
/// `settings.somewhere.foo-list`. In our template we can write:
/// `{{ toml_encode settings.somewhere.foo-list }}`
///
/// This will render `["a", "b", "c"]`.
pub fn toml_encode(
helper: &Helper<'_, '_>,